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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance     $ 376.2  
Other comprehensive income (loss) before reclassifications $ 1.8 $ (18.0) (3.0) $ (9.3)
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 1.3 41.0 2.6 42.8
Amortization of unrecognized prior service credit [1]   (0.1)   (0.1)
Income taxes (0.5) (12.0) (0.9) (12.6)
Total other comprehensive income (loss) 2.6 10.9 (1.3) 20.8
Ending balance 381.9   381.9  
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance (178.1) (188.7) (174.2) (198.6)
Reclassifications [Abstract]        
Ending balance (175.5) (177.8) (175.5) (177.8)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance (40.8) (32.0) (36.0) (40.7)
Other comprehensive income (loss) before reclassifications 1.8 (8.3) (3.0) 0.4
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 0.0 0.0 0.0 0.0
Amortization of unrecognized prior service credit [1]   0.0   0.0
Income taxes 0.0 0.0 0.0 0.0
Total other comprehensive income (loss) 1.8 (8.3) (3.0) 0.4
Ending balance (39.0) (40.3) (39.0) (40.3)
Defined Benefit Plans [Member]        
Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance (137.3) (156.7) (138.2) (157.9)
Other comprehensive income (loss) before reclassifications 0.0 (9.7) 0.0 (9.7)
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 1.3 41.0 2.6 42.8
Amortization of unrecognized prior service credit [1]   (0.1)   (0.1)
Income taxes (0.5) (12.0) (0.9) (12.6)
Total other comprehensive income (loss) 0.8 19.2 1.7 20.4
Ending balance $ (136.5) $ (137.5) $ (136.5) $ (137.5)
[1] Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 3 for additional information about the Company's pension plans.