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Long-term Debt - Senior Notes (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 19, 2017 | Sep. 20, 2017
Debt Instrument [Line Items] |  |  |  |
Payments of Financing Costs |  | $ 1.1 |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  | $ 1.1
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 300.0 | $ 300.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% | 4.875% |  |
Debt Instrument, Maturity Date | Oct. 15, 2025 |  |  |
Payments of Financing Costs |  | $ 5.0 |  |
Debt Issuance Costs, Noncurrent, Net |  |  |  | $ 4.9
Debt Related Commitment Fees and Debt Issuance Costs |  | $ 0.1 |  |
Debt Instrument, Date of First Required Payment | Apr. 15, 2018 |  |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Prior to October 15, 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of principal that can be redeemed with cash from proceeds of an equity offering |  | 35.00% |  |
Debt instrument redemption price with net proceeds from equity offering |  | 104.875% |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2020 to October 14, 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 102.438% |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2021 to October 14, 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 101.219% |  |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2022 and thereafter [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |
Senior Secured Term Loan A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 275.0 |
Debt Instrument, Maturity Date |  |  | Jun. 30, 2020 |
Repayments of Debt |  | $ 250.9 |  |
Interest Paid |  | $ 0.4 |  |
Receivables Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date |  | Jun. 30, 2020 |  |
Repayments of Debt |  | $ 41.7 |  |
Fair Value, Inputs, Level 2 [Member] | Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Fair Value, % of par value | 100.30% | 100.30% |  |

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