Weighted-average period of amortization for finite-lived intangible asset acquired in business combination, asset acquisition, and from joint venture formation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Business Combination and Asset Acquisition (Details) - USD ($) $ in Millions		3 Months Ended
	Nov. 05, 2025	Mar. 31, 2025	Mar. 31, 2026	Dec. 31, 2025
Business Combination [Line Items]
Goodwill			$ 739.9	$ 737.5
Trip Support Services [Member]
Business Combination [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Estimated Working Capital Adjustment Paid to Seller	$ 8.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	8.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash	(0.6)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable	15.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Expenses and Other Current Assets	(0.3)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment	0.0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	1.1
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Not Subject to Amortization	0.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable	(10.7)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets and Liabilities, Net	0.6
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets (Liabilities), Excluding Goodwill	6.1
Goodwill, Measurement Period Adjustment	2.2
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets (Liabilities), Including Goodwill	8.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right Of Use Assets	1.3
Business Combination, Recognized Liability Assumed, Lease Obligation	1.3
Business Combination, Pro Forma Information, Pro Forma Revenue		$ 9,507.7
Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax		$ (19.9)
Business Combination, Price of Acquisition, Future Cash Payments	$ 15.0
Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period	18 years 4 months 24 days
Business Combination, Consideration Transferred, Liabilities Incurred, Undiscounted	$ 60.0
Trip Support Services [Member] \| Preliminary Amount [Member]
Business Combination [Line Items]
Payments to Acquire Businesses, Gross	154.4
Business Combination, Working Capital Adjustment Payable (Receivable)	0.0
Business Combination, Consideration Transferred, Liabilities Incurred	52.6
Business Combination, Consideration Transferred	207.0
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	0.8
Business Combination, Recognized Asset Acquired, Receivable, Current	19.6
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current	0.5
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	0.3
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	87.5
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived	23.1
Business Combination, Recognized Liability Assumed, Accounts Payable, Current	(1.6)
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets And Liabilities, Net	(4.4)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)	125.8
Goodwill	81.3
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	207.0
Trip Support Services [Member] \| Adjusted Amount [Member]
Business Combination [Line Items]
Payments to Acquire Businesses, Gross	154.4
Business Combination, Working Capital Adjustment Payable (Receivable)	8.3
Business Combination, Consideration Transferred, Liabilities Incurred	52.6
Business Combination, Consideration Transferred	215.4
Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent	0.2
Business Combination, Recognized Asset Acquired, Receivable, Current	35.2
Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current	0.2
Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment	0.3
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived	88.6
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Indefinite-Lived	23.4
Business Combination, Recognized Liability Assumed, Accounts Payable, Current	(12.3)
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets And Liabilities, Net	(3.8)
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less)	131.9
Goodwill	83.5
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill	$ 215.4