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Long-Term Debt - Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |
Incremental interest expense | $ 0.1 | $ 0.7 | $ 0.1 | $ 2.6 |
Net benefit expected to be reclassified | 2.7 |  | 2.7 |  |
Interest rate swap and interest rate cap | Derivative instruments and hedging activities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Fair value of derivative | 8.6 |  | 8.6 |  | $ 4.7
Net cash proceeds |  |  | 4.8 |  |
Interest rate swap and interest rate cap | Derivative instruments and hedging activities | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, fair value of interest rate swap and cap positions | 6.6 |  | 6.6 |  | 5.1
Interest rate swap and interest rate cap | Derivative instruments and hedging activities | Other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative asset, fair value of interest rate swap and cap positions | $ 2.0 |  | $ 2.0 |  |
Interest rate swap | Derivative instruments and hedging activities | Other current assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | 0.9
Interest rate swap | Derivative instruments and hedging activities | Other accrued liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | 1.0
Interest rate swap | Derivative instruments and hedging activities | Other long-term liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  |  |  | $ 0.3

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