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Restructuring Activities - Schedule of Board Approved Restructuring (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total Restructuring Program Range      
Total expense $ 30.6 $ 102.2 $ 61.7
Capital expenditures 0.4 $ 3.4 $ 1.0
Program      
Less Cumulative Spend to Date      
Costs of reduction in headcount as a result of reorganization (334.0)    
Other expenses associated with the Program (220.0)    
Total expense (554.0)    
Cumulative capital expenditures (239.0)    
Total cash cost (793.0)    
Program | Minimum      
Total Restructuring Program Range      
Board approved cumulative restructuring spend 840.0    
Costs of reduction in headcount as a result of reorganization 340.0    
Other expenses associated with the Program 255.0    
Total expense 595.0    
Capital expenditures 245.0    
Total estimated cash cost 840.0    
Restructuring and Related Cost, Expected Cost [Abstract]      
Costs of reduction in headcount as a result of reorganization 6.0    
Other expenses associated with the Program 35.0    
Total expense 41.0    
Capital expenditures 6.0    
Total estimated cash cost 47.0    
Program | Maximum      
Total Restructuring Program Range      
Board approved cumulative restructuring spend 885.0    
Costs of reduction in headcount as a result of reorganization 355.0    
Other expenses associated with the Program 270.0    
Total expense 625.0    
Capital expenditures 260.0    
Total estimated cash cost 885.0    
Restructuring and Related Cost, Expected Cost [Abstract]      
Costs of reduction in headcount as a result of reorganization 21.0    
Other expenses associated with the Program 50.0    
Total expense 71.0    
Capital expenditures 21.0    
Total estimated cash cost $ 92.0