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Derivative Financial Instruments and Hedging Activities - Narrative (Details)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
derivative_instrument
Feb. 28, 2018
USD ($)
derivative_instrument
Sep. 30, 2018
USD ($)
derivative_instrument
Sep. 30, 2018
USD ($)
derivative_instrument
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
derivative_instrument
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
derivative_instrument
Unrealized Hedging Losses | Foreign Currency Hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax     $ 0.9          
Designated                
Derivative [Line Items]                
Pre-tax gain included in accumulated other comprehensive loss for interest rate derivatives           $ 55.0   $ 26.9
Pre-tax gains (losses) included in accumulated other comprehensive loss for foreign exchange derivatives           $ 0.3   $ (3.4)
Designated | Interest rate caps                
Derivative [Line Items]                
Number of derivative instruments terminated | derivative_instrument 8 8            
Number of derivative instruments held | derivative_instrument 8   8 8   8    
Designated | Interest rate swaps                
Derivative [Line Items]                
Number of derivative instruments terminated | derivative_instrument 5              
Number of derivative instruments held | derivative_instrument 4   4 4   4    
Designated | Interest rate hedge                
Derivative [Line Items]                
Cash settlement received in exchange for net hedge asset $ 9.6 $ 34.5            
Designated | Foreign Currency Hedge                
Derivative [Line Items]                
Cash settlement received in exchange for net hedge asset     $ 13.9          
Designated | Unrealized Hedging Gains | Interest rate hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax       $ (0.7)        
Non-Designated | Foreign currency forward contracts                
Derivative [Line Items]                
Number of derivative instruments held | derivative_instrument 27   27 27   27   24
Gain (loss) on derivative instruments       $ 0.0 $ 3.9 $ 1.1 $ (0.5)  
Notional amount $ 89.4   $ 89.4 89.4   89.4   $ 277.5
Interest Expense | Unrealized Hedging (Losses) Gains | Interest rate hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax       (2.5) 2.0 (8.9) 5.9  
Interest Expense | Unrealized Hedging (Losses) Gains | Foreign Currency Hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax       0.1        
Operating, Administrative and Other | Unrealized Hedging (Losses) Gains | Foreign Currency Hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax       $ (1.0) $ 3.3 $ (5.3)    
Operating, Administrative and Other | Unrealized Hedging Losses | Foreign Currency Hedge                
Derivative [Line Items]                
(Gains) losses reclassified into earnings, pre-tax             $ 11.0