Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Not Designated as Hedging Instrument [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Dec. 31, 2012 Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 12.6	$ 20.4	$ 21.9	$ 50.9
Gains included in other comprehensive income for de-designated derivative contracts			0.1
Losses recognized on de-designated derivative contracts			5.5
Losses in AOCI to be reclassified in 12 months	(0.6)
Cash collateral on our hedges	$ 0.8	$ 0.6