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Long-Term Debt - Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Incremental interest expense | $ 0.1 | $ 1.2 |
Net benefit expected to be reclassified | 1.0 |  |
Interest rate swap and interest rate cap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative asset, fair value of interest rate swap and cap positions | 6.7 |  |
Net cash proceeds | 4.8 |  |
Interest rate swap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of outstanding interest rate swap and interest rate cap |  |  | $ 4.7
Other assets | Interest rate swap and interest rate cap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative asset, fair value of interest rate swap and cap positions | 6.1 |  | 5.1
Other current assets | Interest rate swap and interest rate cap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative asset, fair value of interest rate swap and cap positions | $ 0.6 |  |
Other current assets | Interest rate swap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  | 0.9
Other long-term liabilities | Interest rate swap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  | 0.3
Other accrued liabilities | Interest rate swap | Derivative instruments and hedging activities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative liability, fair value of interest rate swap and cap positions |  |  | $ 1.0

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