Accounting Policies - Additional Information (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	May 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum recurring transfer (up to)		$ 200,000,000		$ 150,000,000
Accounts receivable	$ 1,020,900,000		$ 969,300,000
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 332,700,000