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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Oct. 01, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | $ 279.0 | $ (33.5) |  |
Stock Issued During Period, Shares, New Issues |  | 65,550,000 |  |  |  |
Shares Issued, Price Per Share |  | $ 9.25 |  |  |  |
Proceeds from (Repurchase of) Equity |  | $ 585.5 |  |  |  |
Increase in Common Stock, value due to Equity Issuance |  | 6.6 |  |  |  |
Increase in Additional Paid in Capital due to Equity Issuance |  | $ 578.9 |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,822,432 |  |  |  |  |
Five Point Seven Five Percent Senior Notes [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.75% |  |  | 5.75%
Debt Instrument, Face Amount |  |  | $ 1,025.0 |  |  |
Five Point Seven Five Percent Senior Notes [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  | $ 24.5 |
Gain (Loss) on Extinguishment of Debt | $ 9.0 |  |  |  |  |
Debt Instrument, Face Amount | $ 1,000.0 |  |  |  |  |

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