Derivative Financial Instruments (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivative Financial Instruments [Abstract]
Adjustment Interval of Variable Rate on Interest Rate Swap	90
Derivative asset	$ 9.6		$ 6.9
Interest income (expense) related to the ineffectiveness associated with the fair value hedge	2.7	$ 1.3
Interest rate swap agreement for notional amount	$ 100.0