Supplemental Balance Sheet Information - Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accounts receivable	$ 141.6	$ 166.8
Accounts receivable, net	137.8	163.8
Other receivables	30.4	14.3
Doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances and doubtful accounts	(3.6)	(2.7)
Sales discounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances and doubtful accounts	$ (0.2)	$ (0.3)