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Share-Based Compensation Arrangements (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Share-Based Compensation Arrangements (Textual) [Abstract]          
Share based compensation, unrecognized liability $ 2.2   $ 2.2   $ 0.8
DSUs [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense 0.6 0.6 1.0 0.6  
Share-Based Compensation Arrangements (Textual) [Abstract]          
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards     0.2 0  
Other Deferred Compensation Arrangements, Liability, Current 1.4   1.4   0.6
Stock Appreciation Rights And Phantom Shares [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense 1.0 1.4 2.4 1.4  
Share-Based Compensation Arrangements (Textual) [Abstract]          
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards     $ 1.6 $ 0.1  
Common Class A [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock price $ 10.93   $ 10.93   $ 4.62