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
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Payments To Acquire Property Plant And Equipment Net $ 861.6 [1] $ 1,127.5 [1] $ 862.1 [1]
Property, Plant and Equipment, Additions 752.3 [2] 1,335.3 [2] 960.9 [2]
Non-cash accruals (109.3) 152.5 60.1
Capital leases 0 55.3 38.7
Total (109.3) 207.8 98.8
Pinnacle [Member]
      
Sale Leaseback Transaction, Net Proceeds     $ 18.6
[1] Cash paid for capital expenditures for 2011 has been shown net of cash proceeds of $18.6 million from the Pinnacle longwall sale-leaseback that was completed in October 2011. The adjustment was necessary in 2011 due to the timing of the cash payments related to the longwall.
[2] Includes capital lease additions and non-cash accruals. Refer to NOTE 21 - CASH FLOW INFORMATION.