Allowance for Doubtful Accounts - Summary of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning	$ 4.6	$ 5.4	$ 4.0
Provision for doubtful accounts	6.1	5.1	5.4
Recovery of bad debts	2.4	1.9	0.0
Write-offs of bad debt	(9.1)	(8.1)	(4.6)
Other	0.5	0.3	0.6
Balance at ending	$ 4.5	$ 4.6	$ 5.4