Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Derivative Instruments and Hedging Activities (Details)

v3.10.0.1
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