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Environmental Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]              
Environmental reserves, long-term           $ 305.1 $ 306.4
Environmental loss contingencies, net of expected recoveries, in excess of accrual       $ 240.0      
Recorded Recoveries [Roll Forward]              
Environmental charges, net   $ 2.7 $ 8.1 8.3 $ 17.1    
Environmental provision, net   31.9 13.3 52.7 29.6    
Middleport Litigation | Pending Litigation              
Recorded Recoveries [Roll Forward]              
Increase in reserve   25.0          
Pocatello Tribal Litigation | Pending Litigation              
Recorded Recoveries [Roll Forward]              
Annual environmental remediation fee $ 1.5            
Continuing Operations              
Recorded Recoveries [Roll Forward]              
Environmental charges, net   2.7 8.1 8.3 17.1    
Discontinued Operations              
Recorded Recoveries [Roll Forward]              
Environmental charges, net   29.2 5.2 44.4 12.5    
Other Assets Including Long-term Receivables, Net              
Recorded Recoveries [Roll Forward]              
Environmental Recoveries, beginning       27.2      
Increase in Recoveries       0.4      
Cash Received       (10.8)      
Environmental Recoveries, ending   16.8   16.8      
Other Liabilities              
Recorded Recoveries [Roll Forward]              
Environmental remediation provision, net   31.9 13.3 53.1 31.4    
Other Assets              
Recorded Recoveries [Roll Forward]              
Environmental remediation provision, net   0.0 $ 0.0 (0.4) $ (1.8)    
Gross              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2016       378.1      
Provision/(benefit)       53.1      
(Spending)/recoveries       (41.5)      
Foreign currency translation adjustments       5.6      
Net change       17.2      
Total environmental reserves at September 30, 2017   395.3   395.3      
Environmental reserves, current           80.0  
Environmental reserves, long-term           315.3  
Total environmental reserves, net of recoveries at end of period   395.3   378.1   395.3 378.1
Recoveries              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2016       11.4      
Provision/(benefit)       0.0      
(Spending)/recoveries       0.0      
Foreign currency translation adjustments       0.0      
Net change       0.0      
Total environmental reserves at September 30, 2017   11.4   11.4      
Environmental reserves, current           1.2  
Environmental reserves, long-term           10.2  
Total environmental reserves, net of recoveries at end of period   11.4   11.4   11.4 11.4
Net              
Accrual for Environmental Loss Contingencies [Roll Forward]              
Total environmental reserves at December 31, 2016       366.7      
Provision/(benefit)       53.1      
(Spending)/recoveries       (41.5)      
Foreign currency translation adjustments       5.6      
Net change       17.2      
Total environmental reserves at September 30, 2017   383.9   383.9      
Environmental reserves, current           78.8  
Environmental reserves, long-term           305.1  
Total environmental reserves, net of recoveries at end of period   $ 383.9   $ 366.7   $ 383.9 $ 366.7