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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income taxes computed at Federal statutory rate	$ (3.7)	$ (42.6)	$ (64.7)
Foreign affiliate dividends	(35.2)	(35.2)	(37.5)
Foreign operations subject to different income tax rates	47.4	51.4	(235.7)
State income tax	5.2	1.2	(8.5)
Gain on sale of Pantaya	13.8	0.0	0.0
Remeasurements of originating deferred tax assets and liabilities	4.2	(6.9)	(7.4)
Permanent differences	0.9	1.6	1.2
Nondeductible settlement costs	0.0	0.0	16.9
Nondeductible share based compensation	27.1	15.0	4.1
Nondeductible officers compensation	7.3	2.6	2.4
Non-controlling interest in partnerships	3.3	3.8	3.2
Nondeductible interest expense	3.5	0.0	0.0
Examination settlements	0.6	(3.2)	1.7
Other	(0.3)	(2.4)	1.9
Changes in valuation allowance	(57.0)	18.0	313.9
Total provision (benefit) for income taxes	$ 17.1	$ 3.3	$ (8.5)

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