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Fair Value Measurements - Carrying Amounts and Estimated Fair Values, Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Aug. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Letters of credit | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 0.0 |  | $ 0.0
Letters of credit | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 36.3 |  | $ 31.9
Senior Notes | 5.75% Senior Notes due 2025 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument interest rate (as percent) | 5.75% | 5.75% | 5.75%
Senior Notes | 5.75% Senior Notes due 2025 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 199.5 |  | $ 348.5
Senior Notes | 5.75% Senior Notes due 2025 | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 199.5 |  | $ 349.3
Senior Notes | 4.50% Senior Notes due 2028 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument interest rate (as percent) | 4.50% |  | 4.50%
Senior Notes | 4.50% Senior Notes due 2028 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 787.5 |  | $ 785.0
Senior Notes | 4.50% Senior Notes due 2028 | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 784.2 |  | $ 763.6
Senior Notes | 4.75% Senior Notes due 2030 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument interest rate (as percent) | 4.75% |  | 4.75%
Senior Notes | 4.75% Senior Notes due 2030 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 783.5 |  | $ 781.5
Senior Notes | 4.75% Senior Notes due 2030 | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 781.7 |  | $ 755.0
Senior Notes | 4.625% Senior Notes due 2031 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Debt instrument interest rate (as percent) | 4.625% |  | 4.625%
Senior Notes | 4.625% Senior Notes due 2031 | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 392.3 |  | $ 391.5
Senior Notes | 4.625% Senior Notes due 2031 | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | 383.0 |  | 369.4
Other notes payable | Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | 90.7 |  | 66.0
Other notes payable | Estimated Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 90.7 |  | $ 66.0

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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