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COMPENSATION PLANS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended 36 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Feb. 14, 2014
ARLP LTIP
Mar. 31, 2014
ARLP LTIP
Mar. 31, 2013
ARLP LTIP
Mar. 31, 2014
ARLP LTIP
Phantom Share Units (PSUs)
Jan. 22, 2014
ARLP LTIP
Phantom Share Units (PSUs)
Jan. 02, 2014
ARLP LTIP
Phantom Share Units (PSUs)
2011 Grants
Dec. 31, 2013
ARLP LTIP
Phantom Share Units (PSUs)
2011 Grants
Mar. 31, 2014
AHGP LTIP
Mar. 31, 2014
SERP and Deferred Compensation Plans
Mar. 31, 2013
SERP and Deferred Compensation Plans
Mar. 31, 2014
SERP and Deferred Compensation Plans
Phantom Share Units (PSUs)
Mar. 31, 2014
SERP And MGP Deferred Compensation Plan
Mar. 31, 2014
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Mar. 31, 2013
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Feb. 14, 2014
AGP Deferred Compensation Plan
Mar. 31, 2014
AGP Deferred Compensation Plan
Mar. 31, 2014
AGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Mar. 31, 2013
AGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Feb. 14, 2014
MGP Deferred Compensation Plan
Compensation Plans                                      
Units for which vesting requirements were deemed satisfied           101,371                          
Forfeited (in units)             7,045                        
Common units issued upon vesting 64,305                           3,572       2,958
Units granted       175,205                 2,844 3,937     1,340 1,511  
Additional grants authorized (in units)         185,205                            
Share based compensation expense   $ 2.1 $ 1.7           $ 0.4 $ 0.4                  
Fair value as intrinsic value at date of grant (in dollars per unit)       $ 81.16                 $ 81.34 $ 61.67     $ 58.84 $ 48.14  
Units available for grant   2,000,000                                  
Unrecognized compensation expense   19.9                                  
Weighted-average period for recognition of expense   1 year 10 months 24 days                                  
Intrinsic value of outstanding grants       35.5             15.6                
Total unit based obligation recorded   $ 10.1                   $ 11.6       $ 0.8      
Units reserved for issuance under the LTIP               5,215,000                      
Units outstanding                     189,394