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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior notes, carrying amount | $ 2,205.2 | $ 2,204.6
Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents, carrying amount | 885.9 | 793.3
Fair Value | Fair Value, Inputs, Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents, fair value | 885.9 | 793.3
3.15% Senior notes due August 1, 2027 | Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior notes, carrying amount | 424.9 | 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 | 414.4 | 411.1
2.3% Senior notes due December 15, 2031 | Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior notes, carrying amount | 399.4 | 399.4
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 | 343.4 | 338.9
5.6% Senior notes due November 15, 2032 | Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior notes, carrying amount | 499.3 | 499.2
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 | 522.4 | 515.3
3.95% Senior notes due August 1, 2047 | Carrying Amount |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Senior notes, carrying amount | 397.8 | 397.8
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 | 312.3 | 307.7
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 | $ 454.8 | $ 451.9

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 2: 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 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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