Allowance for Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance, allowance for credit losses	$ 7.9
Provision for credit losses	30.9	$ 0.8	$ 0.9
Write-offs charged against the allowance for credit losses	(10.8)
Other	1.6
Ending balance, allowance for credit losses	$ 29.6	$ 7.9