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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, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			$ 11.0	$ 3.3	$ 6.9
6.875% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.875%
6.625% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%	6.625%						6.625%
7.75% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					7.75%		7.75%
6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									6.25%
6.25% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									6.25%
Unsecured Debt [Member] | 6.875% Notes [Member]
Debt Instrument [Line Items]
Long-term debt			400.0	0.0		$ 400.0
Payments of Debt Issuance Costs			6.4
Unsecured Debt [Member] | 6.625% Notes [Member]
Debt Instrument [Line Items]
Long-term debt			0.0	450.0
Debt Instrument, Repurchase Amount	$ 350.0	$ 100.0						$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	5.7	2.0			$ 0.8
Write off of Deferred Debt Issuance Cost	1.3	0.4			0.8
Redemption Premium	$ 3.9	$ 1.1			3.3
Unsecured Debt [Member] | 7.75% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount					100.0		$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities				0.3	3.9
Write off of Deferred Debt Issuance Cost				0.1	0.3
Redemption Premium				2.2	4.5
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt			$ 400.0	$ 400.0					$ 400.0
Payments of Debt Issuance Costs					6.6
Unsecured Debt [Member] | 6.25% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount									$ 400.0
Write off of Deferred Debt Issuance Cost					2.5
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost					$ 8.0

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- Definition

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

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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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