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Acquisitions, Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross $ 730.2 $ 722.4
Accumulated Amortization (386.0) (342.3)
Total $ 344.2 $ 380.1
Weighted-Average Useful Life (years) 10 years 10 years
Customer-related assets    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 414.1 $ 415.6
Accumulated Amortization (185.3) (163.7)
Total $ 228.8 $ 251.9
Weighted-Average Useful Life (years) 11 years 11 years
Technology-based assets    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 233.1 $ 223.2
Accumulated Amortization (152.3) (135.2)
Total $ 80.8 $ 88.0
Weighted-Average Useful Life (years) 7 years 7 years
Intellectual property & other    
Finite-Lived Intangible Assets [Line Items]    
Gross $ 83.0 $ 83.6
Accumulated Amortization (48.4) (43.4)
Total $ 34.6 $ 40.2
Weighted-Average Useful Life (years) 8 years 8 years