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Debt (Schedule of Extinguishment of Debt - Exchange Offers) (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 | Jan. 05, 2017 | Dec. 31, 2016 | Dec. 31, 2012
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [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] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  | 311.2 |  |  | $ 1,093.1 |
Senior Notes [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 55.0 |  | $ 237.6 |  | $ 54.6 |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 500.0
Debt Instrument, Repurchase Amount |  |  |  |  | $ 256.8 |  | 60.1 |  |  |
Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  | 71.4 | $ 328.0 |  | 229.9 | 100.1 |  | 219.2 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | 900.0
Debt Instrument, Repurchase Amount |  |  |  | $ 354.7 |  |  | 105.1 |  |  |
Senior Notes [Member] | 4.70% Senior notes due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  | $ 156.2 | 156.2 |  |  | $ 413.3 | 39.4 |  | $ 817.0 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 1,500.0
Debt Instrument, Repurchase Amount |  |  | $ 159.7 |  |  |  | $ 39.3 |  |  |
Senior Notes [Member] | 8.00% Senior notes due 2024(1) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount | 39.7 |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 332.0 |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount | $ 33.8 |  |  |  |  |  |  |  |  |
Exchange Offers [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  |  |  |  |  |  |  | $ 332.5 |  |
Exchange Offers [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  |  |  |  |  |  |  | 81.7 |  |
Exchange Offers [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  |  |  |  |  |  |  | 69.4 |  |
Exchange Offers [Member] | 4.70% Senior notes due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Amount Paid in Cash |  |  |  |  |  |  |  | 181.4 |  |
Exchange Offers [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 649.5 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 664.5 |  |
Exchange Offers [Member] | Senior Notes [Member] | 8.50% Senior notes due 2019(1) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 145.8 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 163.3 |  |
Exchange Offers [Member] | Senior Notes [Member] | 8.50% senior notes due 2019 exchanged for 8.00% senior notes due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 81.6 |  |
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 129.8 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 138.7 |  |
Exchange Offers [Member] | Senior Notes [Member] | 6.875% Senior notes due 2020 exchanged for 8.00% Senior notes due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 69.3 |  |
Exchange Offers [Member] | Senior Notes [Member] | 4.70% Senior notes due 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | 373.9 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | 362.5 |  |
Exchange Offers [Member] | Senior Notes [Member] | 4.70% senior notes due 2021 exchanged for 8.00% senior notes due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | 181.1 |  |
Exchange Offers [Member] | Senior Notes [Member] | 8.00% Senior notes due 2024(1) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 332.0 |  |

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