Balance Sheet Accounts - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and employee benefits	$ 105.7	$ 105.7
Income taxes	2.1	2.1
Competitive improvement program obligations (see Note 10)	8.5	7.6
Interest payable	4.7	4.1
Contract loss provisions	5.2	6.8
Other	55.5	41.5
Other current liabilities	$ 181.7	$ 167.8