Supplemental Balance Sheet Information - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Other Current Liabilities
Supplemental Balance Sheet Disclosures [Line Items]
Deferred revenue	$ 6.5	$ 6.2
Accrued payroll	2.7	3.3
Other Liabilities
Supplemental Balance Sheet Disclosures [Line Items]
Pension liabilities	$ 22.8	$ 21.1