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Accumulated Other Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ (101.5) $ (131.3) $ (103.9) $ (128.4)
Other comprehensive income before reclassifications (24.3) 10.2 (22.8) 5.9
Reclassifications [Abstract]        
Total other comprehensive (loss) income (23.4) 11.5 (21.0) 8.6
Ending balance (124.9) (119.8) (124.9) (119.8)
Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassifications [Abstract]        
Amortization of unrecognized net loss 1.3 [1] 1.5 [1] 2.7 [1] 3.1 [1]
Amortization of unrecognized prior service credit   (0.3) [1]   (0.6) [1]
Commodity derivatives   0.1 [2]   0.2 [2]
Income taxes (0.4)   (0.9)  
Foreign Currency Translation [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 28.8 13.5 27.3 17.8
Other comprehensive income before reclassifications (24.3) 10.2 (22.8) 5.9
Reclassifications [Abstract]        
Total other comprehensive (loss) income (24.3) 10.2 (22.8) 5.9
Ending balance 4.5 23.7 4.5 23.7
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassifications [Abstract]        
Amortization of unrecognized net loss 0 [1] 0 [1] 0 [1] 0 [1]
Amortization of unrecognized prior service credit   0 [1]   0 [1]
Commodity derivatives   0 [2]   0 [2]
Income taxes 0   0  
Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 0 (1.0) 0 (1.1)
Other comprehensive income before reclassifications 0 0 0 0
Reclassifications [Abstract]        
Total other comprehensive (loss) income 0 0.1 0 0.2
Ending balance 0 (0.9) 0 (0.9)
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassifications [Abstract]        
Amortization of unrecognized net loss 0 [1] 0 [1] 0 [1] 0 [1]
Amortization of unrecognized prior service credit   0 [1]   0 [1]
Commodity derivatives   0.1 [2]   0.2 [2]
Income taxes 0   0  
Defined Benefit Plans [Member]
        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (130.3) (143.8) (131.2) (145.1)
Other comprehensive income before reclassifications 0 0 0 0
Reclassifications [Abstract]        
Total other comprehensive (loss) income 0.9 1.2 1.8 2.5
Ending balance (129.4) (142.6) (129.4) (142.6)
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
        
Reclassifications [Abstract]        
Amortization of unrecognized net loss 1.3 [1] 1.5 [1] 2.7 [1] 3.1 [1]
Amortization of unrecognized prior service credit   (0.3) [1]   (0.6) [1]
Commodity derivatives   0 [2]   0 [2]
Income taxes $ (0.4)   $ (0.9)  
[1] Amounts are included in the calculation of net periodic benefit cost. See Note 4 for additional information.
[2] Reclassifications for commodity derivatives are included in cost of sales.