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Income Taxes - The Tax Cuts and Jobs Act (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Income taxes                  
Federal corporate tax rate (as a percent)     35.00%   21.00% 24.50% 35.00% 35.00%  
Provisional income tax benefit related to deferred tax assets and liabilities           $ 32.0      
Undistributed earnings from foreign subsidiaries $ 79.8       $ 79.8 79.8      
One-time transition tax on accumulated foreign earnings           64.0      
Valuation allowance 197.1       197.1 197.1 $ 138.4    
Change in valuation allowance           58.7      
Amount of uncertain tax positions for future years 27.7 $ 26.2              
Benefits related to excess foreign tax credits expected to be realized             $ 25.2    
United States                  
Income taxes                  
Valuation allowance 38.1       38.1 38.1      
Canada                  
Income taxes                  
Valuation allowance 13.1       $ 13.1 $ 13.1      
Change in valuation allowance $ 13.1                
United Kingdom                  
Income taxes                  
Change in valuation allowance       $ (59.9)          
Europe                  
Income taxes                  
Benefit due to reinvesting portion of undistributed earnings                 $ 21.2