Derivative Financial Instruments (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Adjustment Interval of Variable Rate on Interest Rate Swap	90
Derivative asset	$ 4.9		$ 4.2
Interest income (expense) related to the ineffectiveness associated with the fair value hedge	0.7	$ 1.6
Interest rate swap agreement for notional amount	100.0
July 2013 Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Interest rate swap agreement for notional amount	$ 100.0