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Long-Term Debt - Long-Term Debt Notes Payable Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		$ 634.7	$ 408.0	$ 356.3
Payments of Debt Issuance Costs		9.2	11.0	$ 3.3
Unsecured Debt [Member] | 5.00% Notes due 2029
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 600.0
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Payments of Debt Issuance Costs		$ 9.2
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.25%
Debt Instrument, Repurchase Amount		$ 700.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		19.4
Write off of Deferred Debt Issuance Cost		9.6
Redemption Premium		$ 21.9
Unsecured Debt [Member] | 6.875% Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 400.0
Debt Instrument, Interest Rate, Stated Percentage			6.875%
Payments of Debt Issuance Costs			$ 6.4
Unsecured Debt [Member] | 6.625% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.625%
Debt Instrument, Repurchase Amount			$ 450.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			7.7
Write off of Deferred Debt Issuance Cost			1.7
Redemption Premium			$ 5.0
Unsecured Debt [Member] | 7.75% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.75%
Debt Instrument, Repurchase Amount				$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities				0.3
Write off of Deferred Debt Issuance Cost				0.1
Redemption Premium				$ 2.2

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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