Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jul. 31, 2018	Jun. 25, 2018	May 23, 2018
Derivative [Line Items]
Remaining maturity of forward foreign exchange contracts, maximum	16 months
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months	$ 0.7
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months	(42.8)
Interest Rate Swap
Derivative [Line Items]
Notional amount	$ 1,700.0	$ 1,700.0	$ 300.0	$ 200.0	$ 1,000.0