Debt - Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, net of current maturities	$ 912.5	$ 937.5
Term Loan [Member]
Debt Instrument [Line Items]
Term loan, due 2019	962.5	987.5
Less: current maturities	(50.0)	(50.0)
Long-term debt, net of current maturities	$ 912.5	$ 937.5