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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at the beginning of the period $ (87.1) $ (61.8)  
Other comprehensive gain (loss) before reclassification (36.7) (26.6)  
Amounts reclassified from accumulated other comprehensive loss 2.2 4.0  
Income tax (expense) benefit (0.6) (2.7)  
Other comprehensive income (35.1) (25.3) $ (30.3)
Balance at the end of the period (122.2) (87.1) (61.8)
Accrued post-retirement benefit liability      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at the beginning of the period (27.4) (32.0)  
Other comprehensive gain (loss) before reclassification (0.6) 3.0  
Amounts reclassified from accumulated other comprehensive loss 2.3 4.5  
Income tax (expense) benefit (0.7) (2.9)  
Other comprehensive income 1.0 4.6  
Balance at the end of the period (26.4) (27.4) (32.0)
Foreign currency translation      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at the beginning of the period (60.0) (30.4)  
Other comprehensive gain (loss) before reclassification (36.7) (29.6)  
Other comprehensive income (36.7) (29.6)  
Balance at the end of the period (96.7) (60.0) (30.4)
Other      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at the beginning of the period 0.3 0.6  
Other comprehensive gain (loss) before reclassification 0.6    
Amounts reclassified from accumulated other comprehensive loss (0.1) (0.5)  
Income tax (expense) benefit 0.1 0.2  
Other comprehensive income 0.6 (0.3)  
Balance at the end of the period 0.9 0.3 0.6
Accumulated Other Comprehensive Income (loss).      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Other comprehensive income $ (35.1) $ (25.3) $ (30.3)