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Significant Accounting Policies Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]      
Foreign Currency Translation Adjustment $ 7.8 $ 0.7  
Unrealized loss on interest rate derivatives, net of tax (1.7) 0 4.8
Pension and Other Postretirement Benefit Plans, Net of Tax $ (29.9) $ (39.4)