Supplemental Balance Sheet Information - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Supplemental Balance Sheet Disclosures [Line Items]
Deferred revenue	$ 6.4	$ 6.2
Other Current Liabilities
Supplemental Balance Sheet Disclosures [Line Items]
Levy accruals	5.5	5.1
Corporate and legal accruals	2.5	2.6
Accrued payroll	3.2	3.3
Restructuring accruals	0.5	2.2
Royalty accruals	0.0	1.8
Other Liabilities
Supplemental Balance Sheet Disclosures [Line Items]
Pension liabilities	$ 23.9	$ 21.1