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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (188.7) $ (101.5) $ (198.6) $ (103.9)
Other comprehensive income (loss) before reclassifications (18.0) (24.3) (9.3) (22.8)
Reclassifications [Abstract]        
Income taxes (12.0) (0.4) (12.6) (0.9)
Total other comprehensive income (loss) 10.9 (23.4) 20.8 (21.0)
Ending balance (177.8) (124.9) (177.8) (124.9)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 41.0 1.3 42.8 2.7
Amortization of unrecognized prior service credit [1] (0.1)   (0.1)  
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (32.0) 28.8 (40.7) 27.3
Other comprehensive income (loss) before reclassifications (8.3) (24.3) 0.4 (22.8)
Reclassifications [Abstract]        
Income taxes 0.0 0.0 0.0 0.0
Total other comprehensive income (loss) (8.3) (24.3) 0.4 (22.8)
Ending balance (40.3) 4.5 (40.3) 4.5
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
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  
Defined Benefit Plans [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (156.7) (130.3) (157.9) (131.2)
Other comprehensive income (loss) before reclassifications (9.7) 0.0 (9.7) 0.0
Reclassifications [Abstract]        
Income taxes (12.0) (0.4) (12.6) (0.9)
Total other comprehensive income (loss) 19.2 0.9 20.4 1.8
Ending balance (137.5) (129.4) (137.5) (129.4)
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 41.0 $ 1.3 42.8 $ 2.7
Amortization of unrecognized prior service credit [1] $ (0.1)   $ (0.1)  
[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 4 for additional information about the Company's pension plans.