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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes computed at Federal statutory rate	$ (42.6)	$ (64.7)	$ 46.8
Foreign affiliate dividends	(35.2)	(37.5)	(329.1)
Foreign operations subject to different income tax rates	51.4	(235.7)	7.1
State income tax	1.2	(8.5)	(21.2)
Remeasurement of opening U.S. deferred tax liabilities due to the Tax Act	0.0	0.0	(165.0)
Additional remeasurements of originating deferred tax assets and liabilities	0.0	0.0	75.6
Permanent differences	8.0	6.8	3.5
Nondeductible settlement costs	0.0	16.9	0.0
Other	2.5	0.3	(5.3)
Increase in valuation allowance	18.0	313.9	68.2
Total provision (benefit) for income taxes	$ 3.3	$ (8.5)	$ (319.4)

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