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Accounting Policies - Summary of Receivables Sold (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]    
Gross receivables sold/cash proceeds received $ 959.1 $ 583.0
Collections reinvested under revolving agreement 874.9 485.5
Net cash proceeds received $ 84.2 $ 97.5