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Product Warranties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in accrued warranty costs [Roll Forward]        
Beginning balance $ 8.4 $ 11.3 $ 8.3 $ 10.4
Warranties recorded at time of sale 1.1 1.2 2.5 2.6
Adjustments to pre-existing warranties (0.2) (0.7) (0.1) 0.1
Settlements (1.0) (1.7) (2.3) (3.2)
Effect of exchange rate changes 0.1 (0.1) 0.0 0.1
Ending balance $ 8.4 $ 10.0 $ 8.4 $ 10.0