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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2020 | Sep. 30, 2015
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Carrying Amount | Other notes payable |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 66.0 | $ 53.1 |  |
Estimated Fair Value | Other notes payable |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | 66.0 | 53.1 |  |
Advances under revolving credit facility | Carrying Amount |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | 0.0 | 55.0 |  |
Advances under revolving credit facility | Estimated Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | 0.0 | 55.0 |  |
Letter 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 |  |
Letter of Credit | Estimated Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 31.9 | $ 32.7 |  |
5.75% Senior Notes due 2025 | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt instrument interest rate (percent) | 5.75% | 5.75% |  | 5.75%
5.75% Senior Notes due 2025 | Carrying Amount | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 348.5 | $ 347.7 |  |
5.75% Senior Notes due 2025 | Estimated Fair Value | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 349.3 | $ 347.7 |  |
4.50% Senior Notes due 2028 | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt instrument interest rate (percent) | 4.50% | 4.50% |  |
4.50% Senior Notes due 2028 | Carrying Amount | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 785.0 | $ 781.8 |  |
4.50% Senior Notes due 2028 | Estimated Fair Value | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 763.6 | $ 726.7 |  |
4.75% Senior Notes due 2030 | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt instrument interest rate (percent) | 4.75% | 4.75% |  |
4.75% Senior Notes due 2030 | Carrying Amount | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 781.5 | $ 779.0 |  |
4.75% Senior Notes due 2030 | Estimated Fair Value | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 755.0 | $ 703.7 |  |
4.625% Senior Notes due 2031 | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Debt instrument interest rate (percent) | 4.625% | 4.625% | 4.625% |
4.625% Senior Notes due 2031 | Carrying Amount | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 391.5 | $ 390.6 |  |
4.625% Senior Notes due 2031 | Estimated Fair Value | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Carrying amounts and estimated fair values of financial instruments | $ 369.4 | $ 342.2 |  |

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- Definition 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. + References No definition available. + Details
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