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Other Deductions, Net - Summary of Other Deductions, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Income and Expenses [Abstract]              
Amortization of intangibles (excluding software) $ 32.2 $ 32.4 $ 64.6 $ 65.2      
Restructuring costs (see Note 4) 2.4 4.6 1.3 5.4 $ 20.7 $ 46.2 $ 41.6
Foreign currency loss (gain), net 2.8 (5.3) 4.6 (1.8)      
Capitalized software write-off (see Note 5) 12.3 0.0 12.3 0.0      
Other, net (0.2) (3.6) 1.0 (1.8)      
Other deductions, net $ 49.5 $ 28.1 $ 83.8 $ 67.0