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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
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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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