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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 01, 2020
May 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
May 31, 2018
Business Acquisition [Line Items]            
Goodwill acquired     $ 2,589.3 $ 2,343.4 $ 2,321.8  
Acquisition related costs     0.0 0.6 30.6  
Integration related costs     $ 19.3 $ 27.6 $ 29.8  
HYLA            
Business Acquisition [Line Items]            
Consideration transferred $ 348.8          
Business combination, base purchase price 325.0          
Business combination, purchase price adjustment 23.8          
Business combination, net asset acquired 32.5          
Goodwill acquired 226.8          
Business combination, acquired intangible assets other than goodwill 89.5          
Business combination, deferred tax liabilities $ 23.7          
HYLA | Customer Relationships | Minimum            
Business Acquisition [Line Items]            
Intangible assets acquired, weighted average useful life 15 years          
HYLA | Software | Maximum            
Business Acquisition [Line Items]            
Intangible assets acquired, weighted average useful life 6 years          
American Financial & Automotive Services            
Business Acquisition [Line Items]            
Consideration transferred   $ 176.9        
Business combination, base purchase price   157.5        
Business combination, purchase price adjustment   17.9        
Goodwill acquired   104.0        
Business combination, acquired intangible assets other than goodwill   $ 75.8        
Intangible assets acquired, weighted average useful life   15 years        
Business combination, contingent consideration   $ 1.5        
Business combination, estimated liabilities assumed   $ 2.9        
TWG Holdings Limited            
Business Acquisition [Line Items]            
Business combination, total enterprise value acquired           $ 2,470.0