Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Derivative [Line Items]
Losses in AOCI to be reclassified in 12 months	$ (0.2)
Cash collateral on our hedges	1.2		0.8
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount outstanding	10.6		12.6
Losses recognized on de-designated derivative contracts	0.3	1.3
Gains included in other comprehensive income for de-designated derivative contracts	0.1	0.8
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount outstanding	$ 18.4		$ 21.9