Supplemental Balance Sheet Information - Accounts Receivable (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Accounts receivable	$ 162.8	$ 166.8
Accounts receivable, net	159.6	163.8
Income taxes receivable, current	28.9	14.3
Doubtful accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances and doubtful accounts	(2.9)	(2.7)
Sales discounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Allowances and doubtful accounts	$ (0.3)	$ (0.3)