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Stock-Based Compensation - PRSU, RSU and DSU activity and related information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Performance-based Restricted Stock Units [Member]
       
Number of shares        
Beginning balance (in shares)     0.3  
Granted (in shares)     0.3  
Vested (in shares)     0  
Forfeited (in shares)     (0.3)  
Ending balance (in shares) 0.3   0.3  
Weighted average grant date fair value        
Beginning balance (in dollars per share)     $ 39.04  
Granted (in dollars per share)     $ 51.86  
Vested (in dollars per share)     $ 37.05  
Forfeited (in dollars per share)     $ 39.56  
Ending balance (in dollars per share) $ 51.86   $ 51.86  
Ending balance, Aggregate Intrinsic Value $ 16.7   $ 16.7  
Maximum number of shares to be awarded (in shares) 0.7   0.7  
Award performance period     1 year  
Aggregate intrinsic value of RSU's     1.4 14.9
Performance Share Awards, Actual Payout Percentage     100.00% 282.00%
Restricted Stock Units (RSUs) [Member]
       
Weighted average grant date fair value        
Award vesting period     1 year  
Aggregate intrinsic value of RSU's 0.5 5.9 5.4 6.4
Restricted Stock Units And Deferred Stock Units [Member]
       
Number of shares        
Beginning balance (in shares)     0.2  
Granted (in shares)     0  
Vested (in shares)     (0.1)  
Forfeited (in shares)     0  
Ending balance (in shares) 0.1   0.1  
Weighted average grant date fair value        
Beginning balance (in dollars per share)     $ 47.00  
Granted (in dollars per share)     $ 52.87  
Vested (in dollars per share)     $ 44.00  
Forfeited (in dollars per share)     $ 46.6  
Ending balance (in dollars per share) $ 49.41   $ 49.41  
Ending balance, Aggregate Intrinsic Value $ 5.0   $ 5.0  
Award vesting period     1 year  
Performance period ending December 31, 2015 | Performance-based Restricted Stock Units [Member]
       
Weighted average grant date fair value        
Award performance period     2 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 0.3   0.3  
Performance period ending December 31, 2016 | Performance-based Restricted Stock Units [Member]
       
Weighted average grant date fair value        
Award performance period     3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 0.4   0.4  
Maximum [Member] | Performance-based Restricted Stock Units [Member]
       
Weighted average grant date fair value        
Performance Share Awards, Actual Payout Percentage       300.00%