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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (177.8) $ (124.9) $ (198.6) $ (103.9)
Other comprehensive income (loss) before reclassifications (4.0) (15.1) (13.3) (37.9)
Reclassifications [Abstract]        
Income taxes (1.7) (0.5) (14.3) (1.4)
Total other comprehensive income (loss) (3.3) (14.3) 17.5 (35.3)
Ending balance (181.1) (139.2) (181.1) (139.2)
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 2.5 1.3 45.3 4.0
Amortization of unrecognized prior service credit [1] (0.1)   (0.2)  
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (40.3) 4.5 (40.7) 27.3
Other comprehensive income (loss) before reclassifications (6.2) (15.1) (5.8) (37.9)
Reclassifications [Abstract]        
Income taxes 0.0 0.0 0.0 0.0
Total other comprehensive income (loss) (6.2) (15.1) (5.8) (37.9)
Ending balance (46.5) (10.6) (46.5) (10.6)
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 (137.5) (129.4) (157.9) (131.2)
Other comprehensive income (loss) before reclassifications 2.2 0.0 (7.5) 0.0
Reclassifications [Abstract]        
Income taxes (1.7) (0.5) (14.3) (1.4)
Total other comprehensive income (loss) 2.9 0.8 23.3 2.6
Ending balance (134.6) (128.6) (134.6) (128.6)
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Reclassifications [Abstract]        
Amortization of unrecognized net loss [1] 2.5 $ 1.3 45.3 $ 4.0
Amortization of unrecognized prior service credit [1] $ (0.1)   $ (0.2)  
[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.