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SHARE-BASED COMPENSATION: (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Dec. 31, 2012
Restricted stock units
Dec. 31, 2011
Restricted stock units
Dec. 31, 2012
Restricted stock units
Non-performance based
Mar. 31, 2012
Restricted stock units
Non-performance based
Dec. 31, 2012
Restricted stock units
Vesting in equal annual increments over four years
Dec. 31, 2012
Restricted stock units
Vesting in one year
Dec. 31, 2012
Restricted stock units
Performance-based
Mar. 31, 2012
Restricted stock units
Performance-based
Dec. 31, 2012
Restricted stock units
Vesting based on total shareholder return
Dec. 31, 2012
Restricted stock units
Vesting based on total shareholder return
Minimum
Dec. 31, 2012
Restricted stock units
Vesting based on total shareholder return
Maximum
Dec. 31, 2012
Restricted stock units
Vesting based on common stock price targets
Executive officer
Dec. 31, 2012
Restricted stock units
Vesting based on common stock price targets
Maximum
Executive officer
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Share-based compensation                              
Share-based compensation expense $ 7.5 $ 6.0                       $ 1.4 $ 0.9
Future share-based compensation expense expected 19.5                         5.4  
Period for recognition of unrecognized stock-based compensation expense 4 years                         4 years  
Non-vested restricted stock unit activity                              
Outstanding at the beginning of the period (in shares)     1,175,161       511,864                
Granted (in shares)     650,251   573,072 77,179 384,563   333,463     51,100      
Vested (in shares)     (464,688)                        
Forfeited or cancelled (in shares)     (166,588)                        
Outstanding at the end of the period (in shares)     1,194,136 1,175,161     896,427 511,864              
Non-vested restricted stock units, Weighted average fair value per share at grant date                              
Outstanding at the beginning of the period (in dollars per share)     $ 13.40       $ 10.91                
Granted (in dollars per share)     $ 13.89       $ 13.50                
Vested (in dollars per share)     $ 12.63                        
Forfeited or cancelled (in dollars per share)     $ 13.97                        
Outstanding at the end of the period (in dollars per share)     $ 13.89 $ 13.40     $ 12.02 $ 10.91              
Weighted-average remaining contractual term (in years)                              
Weighted-average remaining contractual term at the beginning of the period     2 years 5 months 16 days 2 years 2 months 16 days     1 year 9 months 22 days 2 years 3 months 22 days              
Weighted-average remaining contractual term at the end of the period     2 years 5 months 16 days 2 years 2 months 16 days     1 year 9 months 22 days 2 years 3 months 22 days              
Restricted Stock Unit Activity - Other disclosures                              
Pricing model used for share-based compensation arrangement             Monte Carlo             binomial lattice  
Aggregate fair value of restricted stock units granted     $ 9.0       $ 5.2                
Performance share awards vested (as a percent)                   0.00% 200.00%   100.00%    
Award vesting period         4 years 1 year