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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Mar. 31, 2015
Property, plant and equipment [Abstract]    
Gross property, plant and equipment $ 1,006.4 $ 994.8
Accumulated depreciation (678.2) (672.7)
Net property, plant and equipment $ 328.2 $ 322.1