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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes computed at Federal statutory rate	$ (64.7)	$ 46.8	$ (47.1)
Foreign affiliate dividends	(37.5)	(329.1)	(84.2)
Foreign operations subject to different income tax rates	(235.7)	7.1	(14.6)
State income tax	(8.5)	(21.2)	(6.0)
Remeasurement of opening U.S. deferred tax liabilities due to the Tax Act	0.0	(165.0)	0.0
Additional remeasurements of originating deferred tax assets and liabilities	0.0	75.6	0.0
Transaction costs	0.0	0.0	7.3
Permanent differences	6.8	3.5	(0.5)
Nondeductible settlement costs	16.9	0.0	0.0
Other	0.3	(5.3)	(2.3)
Increase (decrease) in valuation allowance	313.9	68.2	(1.5)
Total benefit for income taxes	$ (8.5)	$ (319.4)	$ (148.9)

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