Fair Value Disclosure (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative Asset	$ 150.0	$ 150.0	$ 100.0
Document Period End Date		Sep. 30, 2013
Fair Value Disclosure (Textual) [Abstract]
Derivative Asset, Notional Amount	150.0	150.0	100.0
Derivative, Notional Amount	133.9	133.9	129.2
Cash flow hedge pre-tax loss to be reclassified within twelve months	6.3
Expected After tax reclassification of net losses from accumulated other comprehensive income to earnings in Next Twelve Months	4.0
Aggregate fair value of all derivative instruments with Net liability position	$ 0.4	$ 0.4
Fair Value Hedges [Member]
Fair Value Disclosure (Textual) [Abstract]
Number of instruments, outstanding	2	2	1
Maturity date range of hedge derivatives	2015-2018	2015-2018
Cash Flow Hedges [Member]
Fair Value Disclosure (Textual) [Abstract]
Number of instruments, outstanding	5	5	12
Maturity date range of hedge derivatives	2014-2020	2014-2020