Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	(5.00%)	(4.10%)	(4.20%)	(2.90%)
Unrecognized tax benefits	$ 33.2		$ 33.2		$ 36.1
Unrecognized tax benefits that would impact effective tax rate	28.6		28.6
Income tax penalties and interest accrued	1.0		1.0		1.0
Removal of uncertain tax benefit would affect forecasted annual effective tax	$ 0.1		$ 0.1