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Summary of Accounting Policies - Disaggregated Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Net revenues $ 1,505.3 $ 1,366.1 $ 1,305.0 $ 1,350.7 $ 1,394.8 $ 1,354.5 $ 1,330.3 $ 1,287.2 $ 5,527.1 $ 5,366.8 $ 5,191.2
Software and related services                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 2,871.1 2,477.7 2,165.9
Engineered products and related services                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 2,656.0 $ 2,889.1 $ 3,025.3