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Significant Accounting Policies Warranty (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Standard Product Warranty Disclosure [Abstract]      
Balance at beginning of period $ 8.8 $ 8.7 $ 8.6
Acquired obligations 0.2 0 1.1
Charged to operations 3.8 4.4 1.6
Claims settled 4.2 4.3 2.6
Balance at end of period $ 8.6 $ 8.8 $ 8.7