Income Tax (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate (benefit)	(87.30%)	(14.70%)
Unrecognized tax benefits, related to deficiency interest on positions	$ 18.3		$ 2.4
Increase in potential payment of interest on uncertain tax positions due to acquisitions	9.3
Unrecognized tax benefits, income tax penalties accrued	61.3		$ 27.6
The increase in accrued penalties related to uncertain tax positions due to acquisitions	25.6
Unrecognized tax benefits, income tax penalties and interest expense	$ 14.7	$ 1.2