Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	(5.20%)	(8.00%)	(3.90%)	(2.60%)
Unrecognized tax benefits	$ 34.2		$ 34.2		$ 36.0
Unrecognized tax benefits that would impact effective tax rate	29.7		29.7
Income tax penalties and interest accrued	1.0		1.0
Removal of uncertain tax benefit would affect forecasted annual effective tax	$ 0.1		$ 0.1