Derivative Financial Instruments and Risk Management - Derivative Assets at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 5.6	$ 7.0
Gross Amounts Offset in the Consolidated Balance Sheets	0.0	0.0
Net Presented in the Consolidated Balance Sheets	5.6	7.0
Amount Subject to Master Netting Agreement	(3.3)	(1.7)
Net Amount	$ 2.3	$ 5.3