Summary of Significant Accounting Policies, Accounting for Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pretax net gains (losses) related to foreign currency translation adjustments	$ 0.0	$ 1.4	$ (10.5)