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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill   $ 4,382.9 $ 2,595.9 $ 2,553.0
Sirius Computer Solutions, Inc.        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 52.8      
Accounts receivable 646.1      
Intangible assets, net 1,140.5      
Goodwill 1,572.4      
Other assets 444.6      
Total assets acquired 3,856.4      
Accounts payable-trade 643.8      
Debt 170.1 $ 160.0    
Deferred tax liabilities 208.6      
Other liabilities 415.6      
Total liabilities assumed 1,438.1      
Total preliminary purchase price $ 2,418.3