Use of Estimates - Accounts Receivable Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 11.5	$ 8.5	$ 9.3
Acquisitions	0.0	0.3	0.3
Allowances provided	14.9	18.6	18.2
Write-offs, net of recoveries, credits issued and other	(16.0)	(15.9)	(19.3)
Balance at end of year	$ 10.4	$ 11.5	$ 8.5