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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)
€ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Changes due to currency rate movements and expenses expected to occur, maximum term 13 months    
Gain expected to be reclassified as earnings $ 4.0    
Derivatives designated as hedging instruments | Cross currency swap contracts      
Derivative Financial Instruments      
Derivative liability, fair value 300.0   $ 0.0
Net investment hedges | Derivatives designated as hedging instruments | Foreign currency denominated debt      
Derivative Financial Instruments      
Derivative liability, fair value | €   € 370.0  
Net investment hedges | Derivatives designated as hedging instruments | Cross currency swap contracts      
Derivative Financial Instruments      
Derivative liability, fair value $ 300.0 € 257.2  
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swap contracts      
Derivative Financial Instruments      
Loss on discontinuation of interest rate swap agreements     $ 0.7