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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Mar. 04, 2020	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 951.8	$ 951.8	$ 12.8
Debt Instrument, Repurchase Amount	$ 724.1	$ 724.1	$ 9.7
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%
Senior Notes [Member] | 4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount				$ 12.8
Debt Instrument, Repurchase Amount				$ 9.7
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
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
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] | 8.50% Senior notes due 2019(1)
Extinguishment of Debt [Line Items]
Debt instrument interest rate stated percentage								8.50%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: 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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+ References

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