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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Mar. 31, 2016
Property, plant and equipment [Abstract]    
Gross property, plant and equipment $ 1,057.1 $ 1,043.6
Accumulated depreciation (716.3) (705.0)
Net property, plant and equipment $ 340.8 $ 338.6