Derivative Financial Instruments and Credit Risk - Derivative Liabilities at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Liabilities	$ 2.9	$ 3.9
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Amount Presented in the Consolidated Balance Sheets	2.9	3.9
Amount Subject to Master Netting Agreement	(1.7)	(3.8)
Net Amount	$ 1.2	$ 0.1