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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
A reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:
 
NACoal
 
Bellaire
 
NACCO
Consolidated
Balance at January 1, 2011
$
5.1

 
$
13.9

 
$
19.0

Liabilities settled during the period
—

 
(0.8
)
 
(0.8
)
Accretion expense
0.4

 
0.9

 
1.3

Revision of estimated cash flows
—

 
(0.4
)
 
(0.4
)
Balance at December 31, 2011
$
5.5

 
$
13.6

 
$
19.1

Liabilities acquired with the Reed Minerals acquisition
9.0

 
—

 
9.0

Liabilities settled during the period
—

 
(1.5
)
 
(1.5
)
Accretion expense
0.6

 
1.6

 
2.2

Revision of estimated cash flows
—

 
2.7

 
2.7

Balance at December 31, 2012
$
15.1

 
$
16.4

 
$
31.5