Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 0.5		$ 0.5
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	112.9		112.9		$ 75.8
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk	0.2	$ (0.5)	0.2	$ (1.3)
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk	$ (1.3)	$ 0.1	$ (0.8)	$ 0.5