Restructuring Costs - By Business Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]              
Expense $ 71.7 $ 4.0 $ 73.0 $ 9.4 $ 20.7 $ 46.2 $ 41.6
Americas              
Restructuring Cost and Reserve [Line Items]              
Expense         5.3 13.7 11.7
Asia Pacific              
Restructuring Cost and Reserve [Line Items]              
Expense         $ 3.9 $ 8.3 $ 13.6
Operating Segments | Americas              
Restructuring Cost and Reserve [Line Items]              
Expense     14.8 2.6      
Operating Segments | Asia Pacific              
Restructuring Cost and Reserve [Line Items]              
Expense     10.8 0.1      
Operating Segments | Europe, Middle East, & Africa              
Restructuring Cost and Reserve [Line Items]              
Expense     42.2 6.7      
Corporate              
Restructuring Cost and Reserve [Line Items]              
Expense     $ 5.2 $ 0.0