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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 951.8	$ 721.8	$ 595.4			$ 194.1
Debt Instrument, Repurchase Amount	724.1	771.2				204.5
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount						311.2		$ 1,093.1
Senior Notes [Member] | 4.50% Senior notes due 2024(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	320.0							1.7
Debt Instrument, Repurchase Amount	240.0
Senior Notes [Member] | 4.75%SeniorNotesDue2024Member [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	79.5
Debt Instrument, Repurchase Amount	61.2
Senior Notes [Member] | 8.00% Senior notes due 2024(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	39.7
Debt Instrument, Repurchase Amount	33.8
Senior Notes [Member] | 5.20% Senior notes due 2025(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	335.5							30.7
Debt Instrument, Repurchase Amount	250.0
Senior Notes [Member] | 7.38%SeniorNotesDue2025 [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	139.2
Debt Instrument, Repurchase Amount	109.2
Senior Notes [Member] | 7.20% Senior notes due 2027
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	37.9
Debt Instrument, Repurchase Amount	$ 29.9
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			55.0		$ 237.6		$ 54.6
Debt Instrument, Repurchase Amount					$ 256.8		60.1
Senior Notes [Member] | 6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			71.4	$ 328.0		229.9	100.1	219.2
Debt Instrument, Repurchase Amount				$ 354.7			105.1
Senior Notes [Member] | 4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 156.2	156.2			$ 413.3	39.4	$ 817.0
Debt Instrument, Repurchase Amount			$ 159.7				$ 39.3

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