Income Taxes - Balance Sheet Amounts (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Deferred tax asset, current	$ 12.3	$ 10.9
Deferred tax asset noncurrent	3.4
Deferred tax liability	0.0	(5.8)
Net deferred tax asset	$ 15.7	$ 5.1