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Impairment, Restructuring and Other Exit Costs - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring [Line Items]    
Severance $ 6.6 $ 63.9
Fair value of other impaired assets   25.0
Restructuring Costs 8.0 240.0
Level 3 | Investments    
Restructuring [Line Items]    
Carrying value of investments   95.0
Customer relationships    
Restructuring [Line Items]    
Impairment loss on intangible assets 27.0 34.0
Customer relationships | Other assets | Rationalization of Resources, Investments, Real Estate and Overhead Across Various Geographies    
Restructuring [Line Items]    
Impairment loss on intangible assets $ 31.0  
Customer relationships | Level 3 | Measurement Input, Weighted Average Long-term Revenue Growth Rate    
Restructuring [Line Items]    
Measurement input 2.40%  
Customer relationships | Level 3 | Measurement Input, Weighted Average Cost of Capital    
Restructuring [Line Items]    
Measurement input 12.00%  
Customer relationships | Level 3 | Measurement Input, Customer Attrition Factor    
Restructuring [Line Items]    
Measurement input 10.00%  
Customer relationships | Minimum | Level 3 | Measurement Input, Long-term Revenue Growth Rate    
Restructuring [Line Items]    
Measurement input 2.00%  
Customer relationships | Maximum | Level 3 | Measurement Input, Long-term Revenue Growth Rate    
Restructuring [Line Items]    
Measurement input 5.50%  
AMECO    
Restructuring [Line Items]    
Restructuring Costs $ 8.0 $ 240.0