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Provision for Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Provision for Income Taxes          
Income tax expense (benefit) $ 21.2 $ 9.8 $ 41.4 $ 25.9  
Effective tax rates (as a percent) 32.40% 20.70% 28.70% 23.70%  
Unrecognized tax benefits, excluding penalties and interest $ 4.4   $ 4.4   $ 4.4
Accrued interest and penalties related to uncertain tax positions 0.5   0.5   $ 0.2
Penalties and interest (benefit) expense relating to unrecognized tax benefits $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Statutory tax rate (as a percent)     21.00%    
Germany and Switzerland          
Provision for Income Taxes          
Increase in effective tax rate from impact of foreign statutory rates (as a percent)     4.00%    
Germany | Foreign          
Provision for Income Taxes          
Foreign statutory tax rate for 2017 (as a percent)     30.00%    
Switzerland | Foreign          
Provision for Income Taxes          
Foreign statutory tax rate for 2017 (as a percent)     20.00%