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Pension and Non-pension Post-employment Benefit Plans - Percentages and Assumptions Used in Measuring the Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans      
Weighted average discount rate at December 31 (i) for:      
Benefit obligations 2.90% 2.50% 2.60%
Net pension cost 2.50% 2.60% 3.80%
Weighted average rate of compensation increase for:      
Benefit obligations 4.10% 4.00% 3.90%
Net pension cost 4.00% 3.90% 3.80%
Pension Plans | Discount rate      
Healthcare cost trend rates:      
1% Increase $ (48.1)    
1% Decrease $ 62.1    
Impact on defined benefit obligation, increase in assumption 1.00%    
Impact on defined benefit obligation, decrease in assumption 1.00%    
Pension Plans | Healthcare cost trend rate      
Healthcare cost trend rates:      
1% Increase $ 0.0    
1% Decrease $ 0.0    
Impact on defined benefit obligation, increase in assumption 1.00%    
Impact on defined benefit obligation, decrease in assumption 1.00%    
Other Benefit Plans      
Weighted average discount rate at December 31 (i) for:      
Benefit obligations 3.80% 3.60% 3.90%
Net pension cost 3.60% 3.90% 4.10%
Weighted average rate of compensation increase for:      
Benefit obligations 4.20% 4.60% 4.60%
Net pension cost 4.60% 4.60% 4.60%
Healthcare cost trend rates:      
Immediate trend 5.70% 5.80% 5.90%
Ultimate trend 4.00% 4.50% 4.50%
Other Benefit Plans | Discount rate      
Healthcare cost trend rates:      
1% Increase $ (8.0)    
1% Decrease $ 9.7    
Impact on defined benefit obligation, increase in assumption 1.00%    
Impact on defined benefit obligation, decrease in assumption 1.00%    
Other Benefit Plans | Healthcare cost trend rate      
Healthcare cost trend rates:      
1% Increase $ 6.2    
1% Decrease $ (5.1)    
Impact on defined benefit obligation, increase in assumption 1.00%    
Impact on defined benefit obligation, decrease in assumption 1.00%