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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated balances for each classification of comprehensive income (loss)            
Balance at the beginning of the period $ (81.8) $ (28.0) $ (61.8) $ (31.5) $ (31.5)  
Other comprehensive income (loss) before reclassifications 12.2 (1.9) (8.5) 1.1    
Amounts reclassified from accumulated other comprehensive loss 1.2 0.8 2.3 1.7    
Income tax benefit (expense) (0.5) (0.3) (0.9) (0.7)    
Other comprehensive income (loss) 12.9 (1.4) (7.1) 2.1 (30.3) $ 4.0
Balance at the end of the period (68.9) (29.4) (68.9) (29.4) (61.8) (31.5)
Accrued post-retirement benefit liability            
Accumulated balances for each classification of comprehensive income (loss)            
Balance at the beginning of the period (31.2) (27.6) (32.0) (28.2) (28.2)  
Other comprehensive income (loss) before reclassifications   (0.6)   (0.6)    
Amounts reclassified from accumulated other comprehensive loss 1.3 1.0 2.6 2.0    
Income tax benefit (expense) (0.5) (0.4) (1.0) (0.8)    
Other comprehensive income (loss) 0.8   1.6 0.6    
Balance at the end of the period (30.4) (27.6) (30.4) (27.6) (32.0) (28.2)
Foreign currency translation            
Accumulated balances for each classification of comprehensive income (loss)            
Balance at the beginning of the period (51.1) (1.3) (30.4) (4.3) (4.3)  
Other comprehensive income (loss) before reclassifications 12.2 (1.3) (8.5) 1.7    
Other comprehensive income (loss) 12.2 (1.3) (8.5) 1.7    
Balance at the end of the period (38.9) (2.6) (38.9) (2.6) (30.4) (4.3)
Hedging activities            
Accumulated balances for each classification of comprehensive income (loss)            
Balance at the beginning of the period 0.5 0.9 0.6 1.0 1.0  
Amounts reclassified from accumulated other comprehensive loss (0.1) (0.2) (0.3) (0.3)    
Income tax benefit (expense)   0.1 0.1 0.1    
Other comprehensive income (loss) (0.1) (0.1) (0.2) (0.2)    
Balance at the end of the period $ 0.4 $ 0.8 $ 0.4 $ 0.8 $ 0.6 $ 1.0