XML 22 R50.htm IDEA: XBRL DOCUMENT v2.4.0.8
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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 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)   $ 39.64  
Ending balance (in dollars per share) $ 51.86 $ 51.86  
Ending balance, Aggregate Intrinsic Value $ 15.7 $ 15.7  
Maximum number of shares to be awarded (in shares) 0.7 0.7  
Award performance period   1 year  
Aggregate intrinsic value   1.4 14.9
Actual payout   100.00% 282.00%
Performance-based Restricted Stock Units [Member] | Maximum [Member]
     
Weighted average grant date fair value      
Actual payout     300.00%
Performance-based Restricted Stock Units [Member] | Performance period ending December 31, 2015
     
Weighted average grant date fair value      
Award performance period   2 years  
Performance-based Restricted Stock Units [Member] | Performance period ending December 31, 2016
     
Weighted average grant date fair value      
Award performance period   3 years  
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)   $ 44.18  
Forfeited (in dollars per share)   $ 46.62  
Ending balance (in dollars per share) $ 49.68 $ 49.68  
Ending balance, Aggregate Intrinsic Value 5.3 5.3  
Award vesting period   1 year  
Restricted Stock Units (RSUs) [Member]
     
Weighted average grant date fair value      
Aggregate intrinsic value $ 0.1 $ 5.5 $ 6.4
Award vesting period   1 year