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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% |

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