Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings, carrying amount	$ 49.9	$ 0.0
Senior notes, carrying amount	2,206.3	2,205.1
Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents, carrying amount	57.3	217.5
Short-term borrowings, carrying amount	49.9	0.0
Fair Value \| Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents, fair value	57.3	217.5
Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term borrowings, fair value	49.9	0.0
3.15% Senior notes due August 1, 2027 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, carrying amount	425.0	424.9
3.15% Senior notes due August 1, 2027 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, fair value	419.3	420.1
2.3% Senior notes due December 15, 2031 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, carrying amount	399.5	399.5
2.3% Senior notes due December 15, 2031 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, fair value	353.2	355.4
5.6% Senior notes due November 15, 2032 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, carrying amount	499.4	499.3
5.6% Senior notes due November 15, 2032 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, fair value	521.9	532.3
3.95% Senior notes due August 1, 2047 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, carrying amount	397.9	397.9
3.95% Senior notes due August 1, 2047 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, fair value	314.9	318.4
5.00% Senior notes due June 15, 2052 \| Carrying Amount
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, carrying amount	499.9	499.9
5.00% Senior notes due June 15, 2052 \| Fair Value \| Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes, fair value	$ 452.2	$ 457.3

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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