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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Oct. 31, 2020	Sep. 30, 2015
Carrying Amount | Other notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 94.5	$ 66.0
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	$ 94.5	$ 66.0
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	$ 99.8	$ 348.5
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	$ 99.7	$ 349.3
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	$ 788.4	$ 785.0
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	$ 772.3	$ 763.6
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	$ 784.2	$ 781.5
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	$ 759.0	$ 755.0
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	$ 392.5	$ 391.5
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	369.9	369.4
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	20.0	0.0
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	20.0	0.0
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	$ 36.3	$ 31.9

X

- 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
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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

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

Reference 1: 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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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