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Tender Offers and Open Market Repurchases (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		4 Months Ended	8 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2014	Dec. 31, 2012	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 04, 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 12.8				$ 951.8	$ 951.8
Debt Instrument, Repurchase Amount	9.7				724.1	724.1
Gain (Loss) on Extinguishment of Debt	$ 3.1			$ 0.0	$ 0.0	$ 3.1	$ 194.1
Long-term Debt				$ 544.8
4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					4.70%
4.70% Senior notes due 2021 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								$ 12.8
Debt Instrument, Repurchase Amount								$ 9.7
Debt instrument interest rate stated percentage			4.70%
Senior Note Maturity Year			2021
8.50% Senior notes due 2019(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		8.50%
Senior Note Maturity Year		2019

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

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