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Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 317.7 $ 2,302.0 $ 1,693.7
Total other comprehensive income (loss) 20.1 16.7 (103.1)
Ending balance 510.4 317.7 2,302.0
Pension and Other Post-Employment Benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (14.6) (15.5)  
Other comprehensive income before reclassification 0.0 0.0  
Amounts reclassified from accumulated other comprehensive loss 1.1 0.9  
Total other comprehensive income (loss) 1.1 0.9  
Ending balance (13.5) (14.6) (15.5)
Unrealized Gains on Hedging Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0.0 0.0  
Other comprehensive income before reclassification 1.3 0.0  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Total other comprehensive income (loss) 1.3 0.0  
Ending balance 1.3 0.0 0.0
Foreign Currency Items      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (104.1) (119.9)  
Other comprehensive income before reclassification 17.7 15.8  
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0  
Total other comprehensive income (loss) 17.7 15.8  
Ending balance (86.4) (104.1) (119.9)
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (118.7) (135.4) (32.3)
Other comprehensive income before reclassification 19.0 15.8  
Amounts reclassified from accumulated other comprehensive loss 1.1 0.9  
Total other comprehensive income (loss) 20.1 16.7 (103.1)
Ending balance $ (98.6) $ (118.7) $ (135.4)