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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Derivative [Line Items]    
Remaining maturity of forward foreign exchange contracts, maximum 19 months  
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months $ 0.3  
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months 47.4  
Interest rate swaps    
Derivative [Line Items]    
Gross amount of swaps in an asset position subject to master netting arrangement 174.0 $ 211.2
Gross amount of swaps in an liability position subject to master netting arrangement 229.1 236.3
Net asset of swaps subject to master netting arrangement 24.1 50.8
Net liability of swaps subject to master netting arrangement $ 79.2 $ 75.9