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Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2009
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]            
Equipment Acquired and Leased To Joint Venture     $ 44.7      
J Devices [Member]
           
Schedule of Investments [Line Items]            
Ownership Interest 60.00%     60.00% 30.00% 30.00%
Payments to Acquire Equity Method Investments 67.4   16.7      
Proceeds from Equipment Purchased by Lessee   8.8        
Retained Earnings, Undistributed Earnings from Equity Method Investees       31.8    
Ownership Threshold 2014 [Member] | J Devices [Member]
           
Schedule of Investments [Line Items]            
Maximum ownership ratio of call options       66.00%    
Ownership Threshold 2015 [Member] | J Devices [Member]
           
Schedule of Investments [Line Items]            
Maximum ownership ratio of call options       80.00%    
Second Investment [Member] | J Devices [Member]
           
Schedule of Investments [Line Items]            
Equity Method Investment Unamortized Difference Between Carrying Amount And Underlying Equity       $ (2.9)    
Former NMD Shareholders [Member] | J Devices [Member]
           
Schedule of Investments [Line Items]            
Ownership Interest       34.00%    
Toshiba [Member] | J Devices [Member]
           
Schedule of Investments [Line Items]            
Ownership Interest       6.00%