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Income Taxes (Current and Deferred Income Tax Provision (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current provision (benefit):
Federal	$ 7.8	$ 6.2	$ 12.0
States	2.2	2.5	0.6
International	4.5	(0.2)	5.1
Total current provision	14.5	8.5	17.7
Deferred provision (benefit):
Federal	(143.3)	(77.4)	12.3
States	(9.9)	(7.6)	3.4
International	(10.2)	0.0	(1.8)
Total deferred provision (benefit)	(163.4)	(85.0)	13.9
Total provision (benefit) for income taxes	$ (148.9)	$ (76.5)	$ 31.6

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