Accounts Receivable (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 8.4	$ 10.3
Bad debt expense (benefit)	1.1	(0.5)
Acquisitions	0.6	0.1
Write-offs, net of recoveries	(0.6)	(1.6)
Other	0.3	0.1
Ending balance	$ 9.8	$ 8.4