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Pension and Non-pension Post-employment Benefit Plans - Summary of Plan Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Interest income   $ (0.8) $ (1.3) $ (1.6)
Administrative expenses paid from plan assets   1.3 1.3 1.1
Pension Plans | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net defined benefit liability (asset) $ 377.2 395.5 377.2  
Interest income   9.4 10.0  
Actuarial losses in other comprehensive income   (82.2) (6.1)  
Administrative expenses paid from plan assets   (1.4) (1.4)  
Employer contributions   2.7 2.4  
Employer direct benefit payments   1.0 0.1  
Employer direct settlement payments   0.0 0.0  
Settlement payments from employer   0.0 0.0  
Settlement payments from plan (see note 19(a))   0.1 (11.7)  
Benefit payments from plan   (12.7) (10.5)  
Benefit payments from employer   (1.0) (0.1)  
Foreign currency exchange rate changes and other   (18.4) 35.6  
Net defined benefit liability (asset)   293.0 395.5 377.2
Other Benefit Plans        
Disclosure of net defined benefit liability (asset) [line items]        
Interest income   2.6 2.6 2.6
Administrative expenses paid from plan assets   0.0 0.0 0.0
Other Benefit Plans | Plan assets        
Disclosure of net defined benefit liability (asset) [line items]        
Net defined benefit liability (asset) 0.0 0.0 0.0  
Interest income   0.0 0.0  
Actuarial losses in other comprehensive income   0.0 0.0  
Administrative expenses paid from plan assets   0.0 0.0  
Employer contributions   0.0 0.0  
Employer direct benefit payments   2.3 2.5  
Employer direct settlement payments   2.5 2.0  
Settlement payments from employer   (2.5) (2.0)  
Settlement payments from plan (see note 19(a))   0.0 0.0  
Benefit payments from plan   0.0 0.0  
Benefit payments from employer   (2.3) (2.5)  
Foreign currency exchange rate changes and other   0.0 0.0  
Net defined benefit liability (asset)   0.0 0.0 $ 0.0
UK Main Pension Plan        
Disclosure of net defined benefit liability (asset) [line items]        
Benefit payments from plan 17.0      
Non-cash loss recorded in other comprehensive income $ 17.0 $ 63.3 $ 17.0