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Fair Value Disclosure (Details Textual) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Jun. 30, 2011
Fair Value Hedging [Member]
Jun. 30, 2011
Cash Flow Hedging [Member]
Dec. 31, 2010
Cash Flow Hedging [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impairment Losses [Member]
Jun. 30, 2010
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impairment Losses [Member]
Jun. 30, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impairment Losses [Member]
Jun. 30, 2010
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Inputs, Level 3 [Member]
Impairment Losses [Member]
Derivative (Textual) [Abstract]                    
No. of instruments, outstanding         12 13        
Maturity date range of fair value hedge derivatives       2012-2015 2011-2015          
Additional Fair Value Disclosure (Textuals) [Abstract]                    
Fair Value of Assets             $ 0.6 $ 0.6 $ 1.2 $ 5.4
Fair Value Disclosure (Textuals) [Abstract]                    
Impairment losses related to industry-wide, regulatory mandate   4.8                
No. of Aluminium hopper railcars having economic life decreased 358                  
Aggregate notional amount of outstanding Fair value hedge derivative instruments 350.0   350.0              
Aggregate notional amount of outstanding Cash flow hedge derivative instruments 78.8   130.4              
Expected Pre tax reclassification of net losses from accumulated other comprehensive income to earnings in Next Twelve Months 7.1                  
Expected After tax reclassification of net losses from accumulated other comprehensive income to earnings in Next Twelve Months 4.5                  
Aggregate fair value of all derivative instruments with Net liability position $ 3.4