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Tender Offers and Open Market Repurchases (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 04, 2020	Mar. 31, 2019	Mar. 31, 2018	Feb. 09, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			$ 951.8	$ 721.8			$ 595.4
Debt Instrument, Repurchase Amount			724.1	771.2
Gain (Loss) on Extinguishment of Debt			3.1	194.1	$ (19.0)
Tender Offer				985.0
Extinguishment of Debt, Gain (Loss), Net of Tax				19.0
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount										$ 311.2	$ 1,093.1
Open Market Repurchases [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			12.8
Debt Instrument, Repurchase Amount			$ 9.7
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				$ 156.2	$ 413.3	$ 12.8		$ 156.2		$ 817.0
Debt Instrument, Repurchase Amount						$ 9.7		$ 159.7
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, Repurchased Face Amount							$ 55.0		$ 237.6
Debt Instrument, Repurchase Amount									$ 256.8
Debt instrument interest rate stated percentage	8.50%
Senior Note Maturity Year	2019

X

- Definition

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

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-Name Accounting Standards Codification
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Tender Offer

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