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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Income taxes computed at Federal statutory rate of 35%	$ (47.1)	$ (11.8)	$ 74.7
Foreign affiliate dividends	(84.2)	(59.4)	(44.7)
Foreign and provincial operations subject to different income tax rates	(14.6)	(7.1)	(1.8)
State income tax	(6.0)	(3.8)	1.4
Transaction costs	7.3	0.0	0.0
Permanent differences	(0.5)	6.5	3.0
Other	(2.3)	(0.9)	(1.0)
Increase (decrease) in valuation allowance	(1.5)	0.0	0.0
Total provision (benefit) for income taxes	$ (148.9)	$ (76.5)	$ 31.6

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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