Fair value portion of asset recognized for present right to economic benefit.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in value of liability in contingent consideration arrangement in business combination, including, but not limited to, difference arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-4

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

+ Details

Name:	us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value, as of the balance sheet date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

No definition available.

+ Details

Name:	uthr_BusinessAcquisitionContingentConsiderationFairValueDisclosureLiability
Namespace Prefix:	uthr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_BankTimeDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Liabilities
Increase in fair value of contingent consideration liability			$ 4.1
Recurring fair value measurements \| Other income (expense), net
Liabilities
Net unrealized gain (loss) on securities	$ (4.0)	$ 0.4	(9.3)	$ 6.0
Recurring fair value measurements \| Level 1
Assets
Total assets	633.0		633.0		$ 829.6
Liabilities
Contingent consideration	0.0		0.0		0.0
Total liabilities	0.0		0.0		0.0
Recurring fair value measurements \| Level 1 \| Money market funds
Assets
Total assets	419.4		419.4		649.8
Recurring fair value measurements \| Level 1 \| Time deposits
Assets
Total assets	199.0		199.0		155.9
Recurring fair value measurements \| Level 1 \| U.S. government and agency securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 1 \| Corporate debt securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 1 \| Equity securities
Assets
Total assets	14.6		14.6		23.9
Recurring fair value measurements \| Level 2
Assets
Total assets	3,784.5		3,784.5		3,042.7
Liabilities
Contingent consideration	0.0		0.0		0.0
Total liabilities	0.0		0.0		0.0
Recurring fair value measurements \| Level 2 \| Money market funds
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 2 \| Time deposits
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 2 \| U.S. government and agency securities
Assets
Total assets	3,025.8		3,025.8		2,473.3
Recurring fair value measurements \| Level 2 \| Corporate debt securities
Assets
Total assets	758.7		758.7		569.4
Recurring fair value measurements \| Level 2 \| Equity securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 3
Assets
Total assets	0.0		0.0		0.0
Liabilities
Contingent consideration	28.8		28.8		24.7
Total liabilities	28.8		28.8		24.7
Recurring fair value measurements \| Level 3 \| Money market funds
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 3 \| Time deposits
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 3 \| U.S. government and agency securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 3 \| Corporate debt securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Level 3 \| Equity securities
Assets
Total assets	0.0		0.0		0.0
Recurring fair value measurements \| Balance
Assets
Total assets	4,417.5		4,417.5		3,872.3
Liabilities
Contingent consideration	28.8		28.8		24.7
Total liabilities	28.8		28.8		24.7
Recurring fair value measurements \| Balance \| Money market funds
Assets
Total assets	419.4		419.4		649.8
Recurring fair value measurements \| Balance \| Time deposits
Assets
Total assets	199.0		199.0		155.9
Recurring fair value measurements \| Balance \| U.S. government and agency securities
Assets
Total assets	3,025.8		3,025.8		2,473.3
Recurring fair value measurements \| Balance \| Corporate debt securities
Assets
Total assets	758.7		758.7		569.4
Recurring fair value measurements \| Balance \| Equity securities
Assets
Total assets	$ 14.6		$ 14.6		$ 23.9