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COMPENSATION PLANS (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 36 Months Ended 0 Months Ended 36 Months Ended 24 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Feb. 14, 2014
ARLP LTIP
Feb. 15, 2013
ARLP LTIP
Dec. 31, 2013
ARLP LTIP
Dec. 31, 2012
ARLP LTIP
Dec. 31, 2011
ARLP LTIP
Feb. 22, 2014
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2013
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2012
ARLP LTIP
Phantom Share Units (PSUs)
Dec. 31, 2011
ARLP LTIP
Phantom Share Units (PSUs)
Jan. 22, 2014
ARLP LTIP
Phantom Share Units (PSUs)
Jan. 02, 2013
ARLP LTIP
Phantom Share Units (PSUs)
2010 Grants
Dec. 31, 2012
ARLP LTIP
Phantom Share Units (PSUs)
2010 Grants
Jan. 02, 2014
ARLP LTIP
Phantom Share Units (PSUs)
2011 Grants
Dec. 31, 2013
ARLP LTIP
Phantom Share Units (PSUs)
2011 Grants
Dec. 31, 2013
ARLP LTIP
Phantom Share Units (PSUs)
2013 and 2012 Grants
Dec. 31, 2013
AHGP LTIP
Dec. 31, 2013
SERP and Deferred Compensation Plans
Dec. 31, 2012
SERP and Deferred Compensation Plans
Dec. 31, 2011
SERP and Deferred Compensation Plans
Dec. 31, 2013
SERP and Deferred Compensation Plans
Phantom Share Units (PSUs)
Dec. 31, 2013
SERP And MGP Deferred Compensation Plan
Dec. 31, 2012
SERP And MGP Deferred Compensation Plan
Dec. 31, 2013
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Dec. 31, 2012
SERP And MGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Feb. 14, 2014
AGP Deferred Compensation Plan
Dec. 31, 2013
AGP Deferred Compensation Plan
Dec. 31, 2012
AGP Deferred Compensation Plan
Dec. 31, 2013
AGP Deferred Compensation Plan
Phantom Share Units (PSUs)
Dec. 31, 2012
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             130,102       130,102   101,371                                  
Forfeited (in units)             9,735         8,028   7,045 14,489                              
Common units issued upon vesting 64,305 82,400                                             3,572         2,958
Additional grants authorized (in units)                   185,205                                        
Units granted           175,205 146,725 107,114                             16,869 13,791       5,335 3,867  
Units available for grant     2,100,000                                                      
Share based compensation expense     $ 7.4 $ 6.4 $ 5.3                       $ 1.5 $ 1.0 $ 1.2                      
Total unit based obligation recorded     14.7 12.1                                 11.5 10.7       0.9 0.6      
Fair value as intrinsic value at date of grant (in dollars per unit)             $ 63.02 $ 77.71 $ 66.84                           $ 70.96 $ 60.91       $ 55.61 $ 46.55  
Summary of non-vested LTIP grants                                                            
Balance at the beginning of the period (in units)             340,878                         191,740                    
Granted (in units)           175,205 146,725 107,114                             16,869 13,791       5,335 3,867  
Vested (in units)             (130,102)       (130,102)   (101,371)                                  
Forfeited (in units)             (9,735)         (8,028)   (7,045) (14,489)                              
Balance at the end of the period (in units)             347,766 340,878                       191,740                    
Unrecognized compensation expense     8.7                                                      
Weighted-average period for recognition of expense     1 year 7 months 6 days                                                      
Intrinsic value of outstanding grants             $ 26.8                         $ 14.4                    
Units reserved for issuance under the LTIP                               5,215,000                            
Units outstanding             347,766 340,878                       191,740