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Fair Value Disclosure (Details Textual) (USD $)
In Millions, unless otherwise specified
9 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Fair Value Hedging [Member]
Instrument
Dec. 31, 2013
Fair Value Hedging [Member]
Instrument
Sep. 30, 2014
Cash Flow Hedges [Member]
Instrument
Dec. 31, 2013
Cash Flow Hedges [Member]
Instrument
Fair Value Disclosure (Textual) [Abstract]            
Number of instruments, outstanding     6 3 5 6
Derivative Asset, Notional Amount $ 500.0 $ 200.0        
Derivative, Notional Amount 184.5 163.6        
Maturity Date Range of Derivative Instruments     2015 to 2019   2014 to 2020  
Cash Flow Hedge Pre Tax Gain Loss to be Reclassified within Twelve Months (5.8)          
Expected After tax reclassification of net losses from accumulated other comprehensive income to earnings in Next Twelve Months 3.7          
Aggregate fair value of all derivative instruments with Net liability position $ 5.3