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

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Long-Term Debt - Long-Term Debt Notes Payable Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	$ 3.3	$ 6.9	$ 91.0
7.75% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.75%		7.75%
6.625% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.625%
6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.25%
Payments of Debt Issuance Costs		$ 6.6
6.25% Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.25%
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
Long-term debt	$ 0.0	100.0
Unsecured Debt [Member] \| 6.625% Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Debt Instrument, Repurchase Amount					$ 100.0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities		0.8
Write off of Deferred Debt Issuance Cost		0.8
Redemption Premium		3.3
Long-term debt	$ 450.0	450.0
Unsecured Debt [Member] \| 6.25% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Long-term debt	$ 400.0	400.0				$ 400.0
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