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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 80,000,000 80,000,000  
Enova [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU issued, Enova shares 90,052    
Shares withheld for tax, Enova shares 31,264    
2014 LTIP [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to issue of shares 3,400,000    
Shares available for future grants 2,677,126    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares received for the payment of taxes upon issuance of restricted stock units 30,836 42,499 33,479
Shares received for the payment of taxes upon issuance of restricted stock units, value $ 0.7 $ 1.5 $ 1.6
Compensation expenses 6.3 4.1 4.6
Compensation expenses net of tax 4.0 $ 2.6 $ 2.9
Unrecognized compensation cost $ 14.5    
Unrecognized compensation cost, weighted average period (in years) 3 years 7 months 10 days    
Outstanding aggregate intrinsic value $ 38.8    
Vested aggregate intrinsic value 10.4    
Restricted Stock Units (RSUs) [Member] | CAI [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding aggregate intrinsic value 35.6    
Vested aggregate intrinsic value 8.7    
Restricted Stock Units (RSUs) [Member] | Enova [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding aggregate intrinsic value 3.2    
Vested aggregate intrinsic value $ 1.7    
Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 15 years    
Shares Subject to Common Stock Awards [Member] | Enova [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSU issued, Enova shares [1] 90,052    
Shares withheld for tax, Enova shares [1] 31,264    
[1] The Enova shares payable for vested deferred RSUs and Director Deferred Shares are held in a rabbi trust