Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes (in millions)	$ 7.6	$ 4.1	$ 23.1	$ 12.8
Effective tax rate	(40.20%)	120.60%	(220.00%)	(16.80%)