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Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Forecast              
Anticipated cash contributions              
Anticipated cash contributions to pension plans in 2016             $ 15.0
United States Pension Plan of US Entity, Defined Benefit [Member]              
Components of Net Periodic Benefit Costs              
Service cost $ 1.5   $ 2.0   $ 4.6 $ 5.8  
Interest cost 3.4   3.7   10.2 10.6  
Expected return on plan assets (5.0)   (6.3)   (15.0) (18.2)  
Amortization of actuarial loss 0.2   0.2   0.6 0.5  
Amortization of prior service credit         (0.1)    
Net postretirement benefit cost / Net pension cost (credit) 0.1   (0.4)   0.3 (1.3)  
Employer Contributions              
Cash contributions to defined benefit pension plan         10.0    
United States Pension Plan of US Entity, Defined Benefit [Member] | Forecast              
Anticipated cash contributions              
Anticipated cash contributions to pension plans in 2016             11.0
Foreign Pension Plan, Defined Benefit [Member]              
Components of Net Periodic Benefit Costs              
Service cost 0.8   1.0   2.4 3.4  
Interest cost 2.7   2.8   8.0 8.8  
Expected return on plan assets (2.7)   (3.2)   (8.1) (10.0)  
Amortization of initial net obligation 0.1       0.3    
Amortization of actuarial loss 0.5   0.5   1.3 1.7  
Amortization of transition obligation     0.1     0.2  
Amortization of prior service credit           (0.1)  
Settlement loss         1.5    
Net postretirement benefit cost / Net pension cost (credit) 1.4   1.2   5.4 4.0  
Employer Contributions              
Cash contributions to defined benefit pension plan         3.0    
Foreign Pension Plan, Defined Benefit [Member] | Forecast              
Anticipated cash contributions              
Anticipated cash contributions to pension plans in 2016             $ 4.0
Canadian Plans [Member]              
Components of Net Periodic Benefit Costs              
Settlement loss   $ 1.0          
Change in the funded status   $ (5.0)   $ 9.0      
Other Postretirement Benefit Plan, Defined Benefit [Member]              
Components of Net Periodic Benefit Costs              
Service cost 0.2   0.2   0.6 0.6  
Interest cost 0.8   0.8   2.2 2.3  
Amortization of actuarial loss     0.1     0.4  
Amortization of prior service credit (0.9)   (0.5)   (2.5) (1.6)  
Net postretirement benefit cost / Net pension cost (credit) $ 0.1   $ 0.6   $ 0.3 $ 1.7