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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restricted stock units      
Stock-Based Compensation      
Stock-based compensation expense $ 9.8 $ 9.4 $ 8.3
Units      
Vested (in units) (377,000) (348,000) (377,000)
Other disclosures      
Intrinsic value of shares fully vested during the period $ 12.8 $ 11.0 $ 8.4
Unrecognized stock-based compensation expense related to non-vested stock $ 14.8    
Weighted- average period over which unrecognized stock-based compensation cost will be expensed 2 years 6 months    
Total estimated grant date fair values $ 12.2 $ 12.2 $ 11.3
Restricted stock units | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 710,044 658,567 650,655
Granted (in units) 285,332 302,261 335,750
Vested (in units) (280,933) (218,160) (232,787)
Forfeited (in units) (43,708) (32,624) (95,051)
Nonvested at the end of the year (in units) 670,735 710,044 658,567
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 25.05 $ 21.71 $ 21.99
Granted (in dollars per unit) 33.65 29.66 20.26
Vested (in dollars per unit) 23.66 21.60 20.35
Forfeited (in dollars per unit) 29.66 23.36 21.80
Nonvested at the end of the year (in dollars per unit) $ 28.99 $ 25.05 $ 21.71
Restricted stock units | Director Awards      
Units      
Nonvested at the beginning of the year (in units) 84,864 121,356 112,331
Granted (in units) 36,794 49,751 63,497
Vested (in units) (43,512) (85,246) (54,472)
Forfeited (in units) (5,314) (997)  
Nonvested at the end of the year (in units) 72,832 84,864 121,356
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 27.91 $ 22.62 $ 21.33
Granted (in dollars per unit) 30.08 32.50 22.35
Vested (in dollars per unit) 27.82 23.08 19.65
Forfeited (in dollars per unit) 22.43 25.72  
Nonvested at the end of the year (in dollars per unit) $ 29.46 $ 27.91 $ 22.62
Performance-based stock units | Employee Awards      
Units      
Nonvested at the beginning of the year (in units) 128,277 141,302 226,701
Granted (in units) 41,713 54,300 147,300
Vested (in units) (52,616) (44,700) (89,622)
Forfeited (in units) (41,713) (22,625) (143,077)
Nonvested at the end of the year (in units) 75,661 128,277 141,302
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the year (in dollars per unit) $ 23.89 $ 21.84 $ 21.00
Granted (in dollars per unit) 36.19 29.66 21.09
Vested (in dollars per unit) 22.72 21.49 19.49
Forfeited (in dollars per unit) 36.19 29.66 21.21
Nonvested at the end of the year (in dollars per unit) $ 24.70 $ 23.89 $ 21.84
Discontinued Operations | Dosteon | Loss from discontinued operations, net of income taxes | Restricted stock and performance-based restricted stock units      
Stock-Based Compensation      
Stock-based compensation expense $ 0.2 $ 0.1 $ 0.1