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Product Warranties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in accrued warranty costs [Roll Forward]        
Beginning balance $ 11.3 $ 13.9 $ 10.4 $ 14.0
Accruals for warranties issued 1.2 1.6 2.6 3.2
(Reversals) accruals related to pre-existing warranties (0.7) 0.7 0.1 1.3
Settlements (1.7) (2.4) (3.2) (4.8)
Effect of exchange rate changes (0.1) (0.8) 0.1 (0.7)
Ending balance $ 10.0 $ 13.0 $ 10.0 $ 13.0