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Derivative Instruments and Hedging Activities (Textuals) (Details)
€ in Millions, £ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
EUR (€)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Nov. 30, 2016
USD ($)
May 31, 2010
EUR (€)
Derivative Instruments and Hedging Activities (Textuals)                      
Fair value of non-designated foreign exchange forward contracts $ (0.6)   $ (0.6)         $ (0.4)      
Interest Expense $ 48.3 $ 49.9 $ 96.3 $ 100.8              
Cash Flow Hedging [Member]                      
Derivative Instruments and Hedging Activities (Textuals)                      
Derivative, Number of Instruments Held 12   12   12 12          
Notional amount of pay-fixed receive-variable interest rate swap         £ 24.0 € 27.0          
Interest rate hedges                      
Derivative Instruments and Hedging Activities (Textuals)                      
Notional amount of pay-fixed receive-variable interest rate swap             $ 250.0   $ 500.0 $ 400.0 € 50.0
Interest Expense $ 0.7 $ 0.5 $ 1.2 $ 1.0              
Derivative, Fixed Interest Rate                     2.97%