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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 04, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 09, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 951.8		$ 721.8	$ 595.4
Debt Instrument, Repurchase Amount	$ 724.1		771.2
4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	4.70%
4.50% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	4.50%
4.75%SeniorNotesDue2024Member [Member]
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	4.75%
8.00% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	8.00%
5.20% Senior notes due 2025
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	5.20%
7.38%SeniorNotesDue2025 [Member]
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	7.375%
7.20% Senior notes due 2027
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	7.20%
6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	6.875%
8.50% senior notes due 2019
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage	8.50%
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount									$ 311.2	$ 1,093.1
Senior Notes [Member] | 4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 12.8	$ 156.2		$ 413.3	$ 156.2			817.0
Debt Instrument, Repurchase Amount		$ 9.7				$ 159.7
Debt instrument interest rate stated percentage														4.70%
Senior Notes [Member] | 4.50% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 320.0								$ 1.6
Debt Instrument, Repurchase Amount	240.0
Debt instrument interest rate stated percentage												4.50%
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
Debt instrument interest rate stated percentage	4.75%
Senior Notes [Member] | 8.00% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 39.7
Debt Instrument, Repurchase Amount	33.8
Debt instrument interest rate stated percentage									8.00%
Senior Notes [Member] | 5.20% Senior notes due 2025
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	335.5								$ 30.8
Debt Instrument, Repurchase Amount	250.0
Debt instrument interest rate stated percentage											5.20%
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
Debt instrument interest rate stated percentage	7.375%
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
Debt instrument interest rate stated percentage			7.20%
Senior Notes [Member] | 6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount				71.4	$ 229.9		$ 328.0		$ 219.2
Debt Instrument, Repurchase Amount							$ 354.7
Debt instrument interest rate stated percentage													6.875%
Senior Notes [Member] | 8.50% Senior notes due 2019(1)
Extinguishment of Debt [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%

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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