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Debt (Schedule of Extinguishment of Debt - Exchange Offers) (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	Jan. 05, 2017	Dec. 31, 2016	Dec. 31, 2012
Debt Instrument [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]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount						311.2			$ 1,093.1
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			55.0		$ 237.6		$ 54.6
Debt Instrument, Face Amount										$ 500.0
Debt Instrument, Repurchase Amount					$ 256.8		60.1
Senior Notes [Member] | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount			71.4	$ 328.0		229.9	100.1		219.2
Debt Instrument, Face Amount										900.0
Debt Instrument, Repurchase Amount				$ 354.7			105.1
Senior Notes [Member] | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 156.2	156.2			$ 413.3	39.4		$ 817.0
Debt Instrument, Face Amount										$ 1,500.0
Debt Instrument, Repurchase Amount			$ 159.7				$ 39.3
Senior Notes [Member] | 8.00% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	39.7
Debt Instrument, Face Amount	332.0
Debt Instrument, Repurchase Amount	$ 33.8
Exchange Offers [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								$ 332.5
Exchange Offers [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								81.7
Exchange Offers [Member] | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								69.4
Exchange Offers [Member] | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Amount Paid in Cash								181.4
Exchange Offers [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								649.5
Debt Instrument, Repurchase Amount								664.5
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								145.8
Debt Instrument, Repurchase Amount								163.3
Exchange Offers [Member] | Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								81.6
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								129.8
Debt Instrument, Repurchase Amount								138.7
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020 exchanged for 8.00% Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								69.3
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount								373.9
Debt Instrument, Repurchase Amount								362.5
Exchange Offers [Member] | Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								181.1
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024(1)
Debt Instrument [Line Items]
Debt Instrument, Face Amount								$ 332.0

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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