Annual report pursuant to Section 13 and 15(d)

Cash Flow Information (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details)

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Cash Flow Information (Reconciliation Of Capital Additions To Cash Paid For Capital Expenditures) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Oct. 31, 2011
Pinnacle [Member]
Dec. 31, 2010
Pinnacle [Member]
Capital additions $ 960.9 $ 275.8 $ 168.2    
Cash paid for capital expenditures 862.1 [1] 209.6 [1] 116.3 [1]    
Difference 98.8 66.2 51.9    
Non-cash accruals 60.1 8.9 3.0    
Capital leases 38.7 57.3 48.9    
Total 98.8 66.2 51.9    
Cash proceeds from sale-leaseback       $ 18.6 $ 57.3
[1] Cash paid for capital expenditures for 2011 and 2010 has been shown net of cash proceeds of $18.6 and $57.3 million, respectively, from the Pinnacle longwall sale- leaseback that was completed in October 2011 and December 2010. The adjustment was necessary in 2011 and 2010 due to the timing of the cash payments i related to the longwall.