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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Feb. 07, 2018	Dec. 31, 2017	Sep. 30, 2017
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 721.8
Debt Instrument, Repurchase Amount	771.2
8.50% Senior notes due 2019(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	237.6
Debt Instrument, Repurchase Amount	256.8
6.875% Senior notes due 2020(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	328.0
Debt Instrument, Repurchase Amount	354.7
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount							$ 194.1
Debt Instrument, Repurchase Amount							204.5
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	237.6		$ 55.0	$ 182.6		$ 200.4	54.6
Debt Instrument, Repurchase Amount							60.1
Senior Notes [Member] | 6.875% Senior notes due 2020(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	328.0		$ 71.4		$ 256.6	229.9	100.1
Debt Instrument, Repurchase Amount							105.1
Senior Notes [Member] | 4.70% Senior notes due 2021(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 156.2	$ 156.2				$ 413.3	39.4
Debt Instrument, Repurchase Amount		$ 159.7					$ 39.3

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Fair value amount of debt instrument that was repurchased.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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- Definition

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