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SHARE-BASED COMPENSATION: (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Minimum [Member]
Jun. 30, 2014
Maximum [Member]
Jun. 30, 2014
Performance Shares [Member]
Jun. 30, 2014
Performance Shares [Member]
Minimum [Member]
Jun. 30, 2014
Performance Shares [Member]
Maximum [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Time Based Vesting [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Time Based Vesting [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Time Based Vesting over Four Years [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Time Based Vesting in One Year [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Performance Shares [Member]
Mar. 31, 2014
Restricted Stock Units (RSUs) [Member]
Performance Shares [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Performance Shares Vesting Total Shareholder Return [Member]
Minimum [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Performance Shares Vesting Total Shareholder Return [Member]
Maximum [Member]
Jun. 30, 2014
Employee Stock Option [Member]
Jun. 30, 2013
Employee Stock Option [Member]
Jun. 30, 2014
Stock Appreciation Rights (SARs) [Member]
Performance Shares [Member]
Share-based compensation                                      
Share-based compensation expense             $ 3.3 $ 2.7                 $ 0.7 $ 0.5  
Future share-based compensation expense expected       1.0     28.9                   7.2   0.5
Period for recognition of unrecognized stock-based compensation expense       3 years     4 years                   4 years   3 years
Non-vested restricted stock unit activity                                      
Outstanding at the beginning of the period (in shares)                 1,078,029       1,066,828            
Granted (in shares)       201,464         395,902   387,872 8,030 232,274           245,404
Vested (in shares)                 (302,774)       (115,086)            
Forfeited or cancelled (in shares)                 (16,091)       (4,474)            
Outstanding at the end of the period (in shares) 245,404     201,464         1,155,066 1,078,029     1,179,542 1,066,828          
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)                 $ 18.46       $ 14.19            
Granted (in dollars per share)       $ 5.18         $ 21.17       $ 19.29           $ 40.00
Vested (in dollars per share)                 $ 16.19       $ 14.38            
Forfeited or cancelled (in dollars per share)                 $ 21.65       $ 26.00            
Outstanding at the end of the period (in dollars per share) $ 40.00     $ 5.18         $ 19.94 $ 18.46     $ 15.13 $ 14.19          
Weighted-average remaining contractual term                                      
Weighted-average remaining contractual term at the beginning of the period 2 years 9 months 4 days     2 years 9 months 4 days         2 years 7 months 24 days 2 years 2 months 1 day     1 year 1 month 28 days 10 months 28 days          
Weighted-average remaining contractual term at the end of the period 2 years 9 months 4 days     2 years 9 months 4 days         2 years 7 months 24 days 2 years 2 months 1 day     1 year 1 month 28 days 10 months 28 days          
Restricted Stock Unit Activity - Other disclosures                                      
Pricing model used for share-based compensation arrangement                                 binomial lattice    
Aggregate fair value of restricted stock units granted $ 1.0               $ 8.4       $ 4.5           $ 0.5
Exercise price                                     $ 40
Performance share awards vested (as a percent)   0.00% 100.00% 100.00%                     0.00% 200.00%      
Price (in dollars per share)         $ 40 $ 70                         $ 70
Consecutive trading days during the performance period       20 days                             20 days
Award vesting period                     4 years 1 year