Balance Sheet Accounts - Schedule of Other Current Assets, net (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other Current Assets [Line Items]
Recoverable from the U.S. government for acquisition related integration costs	$ 11.9	$ 11.9
Recoverable from the U.S. government for competitive improvement program obligations	8.0	7.6
Prepaid expenses	17.0	16.5
Receivables, net	19.5	17.8
Income taxes receivable	26.8	26.8
Other	7.7	5.6
Other current assets, net	96.4	91.7
UTC
Other Current Assets [Line Items]
Receivables, net	$ 5.5	$ 5.5