Income Taxes - Schedule of Liabilities for Income Tax (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Liabilities for Unrecognized Tax Benefits	$ 5.1	$ 3.8	$ 7.2	$ 6.8