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

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Other Debt Disclosures Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Payments of Debt Issuance Costs				$ 0.0	$ 10.6
Long-term Debt, Weighted Average Interest Rate, at Point in Time				5.90%		5.80%
Proceeds from issuance of long-term debt				$ 22.8	$ 408.8
Unsecured Debt [Member] \| 6.25% Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				6.25%
Long-term Debt				$ 700.0		$ 700.0
Unsecured Debt [Member] \| 6.25% Notes due 2025 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	1.8
Write off of Deferred Debt Issuance Cost	1.4
Redemption Premium	$ 3.1
Unsecured Debt [Member] \| 6.875% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.875%			6.875%
Long-term Debt				400.0		400.0
Payments of Debt Issuance Costs					$ 6.0
Proceeds from issuance of long-term debt		$ 400.0
Unsecured Debt [Member] \| 6.625% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.625%				6.625%
Debt Instrument, Repurchase Amount			$ 100.0				$ 350.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			2.0
Write off of Deferred Debt Issuance Cost			0.4
Redemption Premium			$ 1.1
Foreign Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term Line of Credit				108.7		$ 88.8
Debt Instrument, Unused Borrowing Capacity, Amount				$ 60.7