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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (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 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | --- | --- | ---
Extinguishment of Debt [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] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  | 311.2 |  | $ 1,093.1
Senior Notes [Member] | 4.50% Senior notes due 2024(1) |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 320.0 |  |  |  |  |  |  | 1.7
Debt Instrument, Repurchase Amount | 240.0 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Senior Notes [Member] | 8.00% Senior notes due 2024(1) |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 39.7 |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | 33.8 |  |  |  |  |  |  |
Senior Notes [Member] | 5.20% Senior notes due 2025(1) |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 335.5 |  |  |  |  |  |  | 30.7
Debt Instrument, Repurchase Amount | 250.0 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Senior Notes [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 55.0 |  | $ 237.6 |  | $ 54.6 |
Debt Instrument, Repurchase Amount |  |  |  |  | $ 256.8 |  | 60.1 |
Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 71.4 | $ 328.0 |  | 229.9 | 100.1 | 219.2
Debt Instrument, Repurchase Amount |  |  |  | $ 354.7 |  |  | 105.1 |
Senior Notes [Member] | 4.70% Senior notes due 2021 |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 156.2 | 156.2 |  |  | $ 413.3 | 39.4 | $ 817.0
Debt Instrument, Repurchase Amount |  |  | $ 159.7 |  |  |  | $ 39.3 |

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