Basis of Presentation and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 14.0	$ 14.2	$ 12.8
Bad debt expense	1.4	1.1	2.3
Write-offs, net of recoveries	(4.1)	(0.9)	(2.2)
Other (1)	(1.0)	(0.4)	1.3
Ending balance	$ 10.3	$ 14.0	$ 14.2