Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended
	Feb. 28, 2012	Feb. 27, 2009	Sep. 30, 2012	Sep. 30, 2011	Feb. 14, 2012 Forward Starting Interest Rate Swap Contracts [Member]	Sep. 30, 2012 Contracts translated to US dollars [Member]	Jun. 30, 2012 Contracts translated to US dollars [Member]
Additional Derivative Instruments and Hedging Activities (Textual) [Abstract]
Notional amount of the contracts translated into U.S. dollars					$ 150.0	$ 91.8	$ 69.9
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Terminated Interest Rate Swap Contracts		200.0
Recognize loss on outstanding derivatives in the next 12 months			0.6
Gains or losses recognized in earnings due to ineffectiveness and excluded from effectiveness testing			0	0
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Payments for derivative hedging instrument upon settlement	$ 22.4