Long-Term Debt (Maturities) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2016	Dec. 31, 2014	Dec. 31, 2013
Long-Term Debt
Thereafter		$ 1,200.0
Total		1,200.0
Interest expense	$ 6.3	$ 77.7	$ 3.3	$ 0.0