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Acquisitions, Goodwill and Other Intangible Assets - Pro Forma Financial Information and Acquisition Results (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Combinations [Line Items]      
Business combinations, unaudited supplemental pro forma revenue $ 10,100.0 $ 9,400.0 $ 7,600.0
Business combinations, unaudited supplemental pro forma net income 350.1 366.8 406.6
Business combinations, consolidated acquisition-related revenue 1,000.0 229.9 188.3
Business combinations, consolidated acquisition-related net income 6.6 $ (6.7) $ (1.4)
All other, INTREN acquisition      
Business Combinations [Line Items]      
Business combinations, consolidated acquisition-related revenue $ 436.0