Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 2,032.5		$ 1,238.4
Allowance for credit losses	$ 29.2	$ 51.8	$ 57.3	$ 46.6
Percent accounts receivable outstanding, less than 60 days	93.00%
Account receivable sold under the RPAs	$ 6,800.0	2,600.0
Fees and financing costs under the RPA	$ 14.6	$ 6.8
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sale price of receivables, percentage of sold amount	100.00%