Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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+ Details

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transactions [Abstract]
Services for the corporate advisory services agreement			$ 0.5
Noncash merger costs			25.0
True-up of merger consideration, cash received			$ 5.5
Purchases from related party	$ 24.8	$ 17.0		$ 64.9	$ 40.3
Sales to related party	45.8			45.9		$ 0.0
Accounts payable to affiliates	2.6			2.6		0.0
Accounts receivable from affiliates	$ 31.9			$ 31.9		$ 0.0