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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, 2018
Dec. 31, 2017
Dec. 31, 2019
Apr. 02, 2018
Business Acquisition [Line Items]        
Goodwill $ 1,421.1   $ 1,486.9  
ECS        
Business Acquisition [Line Items]        
Revenues 3,548.9 $ 3,213.5    
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 169.6 134.8    
Net income $ 169.3 $ 134.6    
Basic $ 3.24 $ 2.57    
Diluted $ 3.19 $ 2.53    
Basic Shares 52.4 52.5    
Diluted Shares 53.2 53.2