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Stockholders' Equity - Reconciliation of accumulated other comprehensive loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Increase (Decrease) in Equity [Roll Forward]    
Beginning balance $ 677.5  
Total other comprehensive income, net of tax 12.1 $ 11.2
Ending balance 683.3  
Gains and Losses on Cash Flow Hedges    
Increase (Decrease) in Equity [Roll Forward]    
Beginning balance 0.1 (0.3)
Other comprehensive income (loss) before reclassifications   0.3
Amounts reclassified from accumulated other comprehensive loss   0.2
Total other comprehensive income, net of tax   0.5
Ending balance 0.1 0.2
Pension & Postretirement    
Increase (Decrease) in Equity [Roll Forward]    
Beginning balance (45.1) (51.8)
Other comprehensive income (loss) before reclassifications 0.1  
Amounts reclassified from accumulated other comprehensive loss 0.6 0.6
Total other comprehensive income, net of tax 0.7 0.6
Ending balance (44.4) (51.2)
Foreign Currency Translation    
Increase (Decrease) in Equity [Roll Forward]    
Beginning balance (52.4) (110.8)
Other comprehensive income (loss) before reclassifications 11.4 10.1
Total other comprehensive income, net of tax 11.4 10.1
Ending balance (41.0) (100.7)
Accumulated Other Comprehensive Loss    
Increase (Decrease) in Equity [Roll Forward]    
Beginning balance (97.4) (162.9)
Other comprehensive income (loss) before reclassifications 11.5 10.4
Amounts reclassified from accumulated other comprehensive loss 0.6 0.8
Total other comprehensive income, net of tax 12.1 11.2
Ending balance $ (85.3) $ (151.7)