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Other Debt Disclosures Narrative (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 20, 2021	Jul. 14, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt					$ 622.7	$ 408.9
Payments of Debt Issuance Costs					$ 9.2	11.0
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.60%				5.60%					5.80%
Second Amendment to the Credit Agreement
Debt Instrument [Line Items]
Payments of Debt Issuance Costs						4.6
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%				6.25%				6.25%
Debt Instrument, Repurchase Amount							$ 600.0	$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 1.8				$ 17.6
Write off of Deferred Debt Issuance Cost	1.4				8.2
Redemption Premium	3.1				18.8
Long-term Debt	$ 0.0				$ 0.0					$ 700.0
Unsecured Debt [Member] | 5.00% Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%				5.00%
Long-term Debt	$ 600.0				$ 600.0					0.0
Proceeds from issuance of long-term debt	600.0
Payments of Debt Issuance Costs	9.2
Unsecured Debt [Member] | 6.875% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.875%
Long-term Debt	400.0				400.0					$ 400.0
Proceeds from issuance of long-term debt			$ 400.0
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%		6.625%		6.625%				6.625%
Debt Instrument, Repurchase Amount		$ 350.0		$ 100.0		$ 350.0				$ 350.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		5.7		2.0
Write off of Deferred Debt Issuance Cost		1.3		0.4
Redemption Premium		$ 3.9		$ 1.1
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	102.2				102.2					$ 88.8
Debt Instrument, Unused Borrowing Capacity, Amount	$ 62.3				$ 62.3

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

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