Revenue from Contracts with Customers - Accounts Receivable Reserve for Doubtful Accounts (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of fiscal year	$ 4.6	$ 6.0
Expense to increase the reserve	0.2	0.2
Write-off of uncollectible accounts	(0.3)	(1.0)
Reclassification to held for sale	0.0	0.2
Balance as of period end	$ 4.5	$ 5.0