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INCOME TAXES: (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
INCOME TAXES:    
Effective tax rate (as a percent) 32.10% 25.40%
Federal statutory rate (as a percent) 35.00%  
Allowance for doubtful account activity    
Valuation allowance- beginning balance $ 30.7  
U.S. valuation allowance - State 1.1  
Other 0.2  
Valuation allowance- ending balance 32.0  
Unrecognized tax benefits, which if recognized would impact the effective tax rate 33.3  
Accrued interest and penalties 9.3  
Reasonably possible benefit on resolution of audits, maximum $ 0.7