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Acquisitions Schedule of Purchase Price Allocation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Apr. 02, 2018
Business Acquisition [Line Items]      
Goodwill $ 1,486.9 $ 1,618.4  
Business Combination, Contingent Consideration, Liability, Noncurrent   5.0  
Business Combination, Contingent Consideration, Liability, Noncurrent   5.0  
Maximum [Member]      
Business Acquisition [Line Items]      
Business Combination, Contingent Consideration, Liability, Noncurrent   19.0  
Business Combination, Contingent Consideration, Liability, Noncurrent   $ 19.0  
ECS      
Business Acquisition [Line Items]      
Revenues 3,548.9    
Cash     $ 12.4
Accounts receivable     97.2
Prepaid expenses and other current assets     8.6
Property and equipment     29.0
Identifiable intangible assets     195.0
Goodwill     528.2
Other non-current assets     1.2
Total assets acquired     871.6
Current liabilities     94.7
Long-term liabilities     4.3
Total liabilities assumed     99.0
Total purchase price     $ 772.6
Income from continuing operations 169.6    
Net income $ 169.3    
Basic $ 3.24    
Diluted $ 3.19    
Basic Shares 52.4    
Diluted Shares 53.2