Derivative Financial Instruments (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Net gain (loss)	$ (5.3)	$ (6.7)	$ 8.3
Term loan, effective interest rate	2.37%
Level 2 | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 0.3