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Debt Schedule of Extinguishment of Debt - Open Market Repurchases (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Mar. 31, 2017
--- | --- | ---
Extinguishment of Debt [Line Items] |  |
Debt Instrument, Repurchase Amount |  | $ 664.5
Senior Notes [Member] | Senior Notes [Member] |  |
Extinguishment of Debt [Line Items] |  |
Debt Instrument, Repurchased Face Amount | $ 194.1 | 649.5
Debt Instrument, Repurchase Amount | 204.5 |
Senior Notes [Member] | 8.50% Senior notes due 2019 | Senior Notes [Member] |  |
Extinguishment of Debt [Line Items] |  |
Debt Instrument, Repurchased Face Amount | 54.6 | 145.8
Debt Instrument, Repurchase Amount | 60.1 |
Senior Notes [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member] |  |
Extinguishment of Debt [Line Items] |  |
Debt Instrument, Repurchased Face Amount | 100.1 | 129.8
Debt Instrument, Repurchase Amount | 105.1 |
Senior Notes [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member] |  |
Extinguishment of Debt [Line Items] |  |
Debt Instrument, Repurchased Face Amount | 39.4 | $ 373.9
Debt Instrument, Repurchase Amount | $ 39.3 |

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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