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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Jul. 31, 2018
Jun. 25, 2018
May 23, 2018
Derivative [Line Items]          
Remaining maturity of forward foreign exchange contracts, maximum 22 months        
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months $ 20.8        
Interest rate swap agreements          
Derivative [Line Items]          
Notional amount 1,700.0 $ 1,700.0 $ 300.0 $ 200.0 $ 1,000.0
Maximum          
Derivative [Line Items]          
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months $ 0.7