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Debt - 2025 Notes (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 05, 2015 | Mar. 28, 2015 | Nov. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 11.9 | $ 0.0 | $ 0.0
Cash restricted for use - repurchase of senior notes |  |  |  |  |  | 0.0 | 0.0 | 250.0
Loss on extinguishment of debt |  |  |  |  | $ (21.2) | $ 21.2 | 0.0 | $ 14.3
Credit Agreement — Term Loan Facility | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term loan facility borrowings |  |  | $ 500.0 |  |  |  |  |
Senior notes | 2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | 650.0 |  |  |  |  |
Debt issuance costs |  |  | 8.4 |  |  |  |  |
Senior notes | 2025 Notes | Prior to January 15, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of debt redemption price |  |  |  |  |  | 100.00% |  |
Senior notes | 2025 Notes | Eagle Ottawa |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Restricted cash used to finance the acquisition | $ 350.0 |  |  |  |  |  |  |
Senior notes | 2020 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Cash restricted for use - repurchase of senior notes |  | $ 250.0 | 250.0 |  |  |  |  |
Aggregate principal amount of debt redeemed |  |  | $ 245.0 |  |  |  |  |
Percentage of debt redemption |  | 104.063% |  | 10.00% |  |  |  |
Senior notes | 2020 Notes | Unsecured debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior debt |  | $ 255.0 |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 14.3 |

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