Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2014

Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]

Letters of credit, bank guarantees, surety bonds and corporate guarantees

As of December 31, 2014, the Company had the following financial instruments with off-balance-sheet risk:

	Reclamation Obligations		Coal Lease Obligations		Workers’ Compensation Obligations		Other(1)		Total
	(Dollars in millions)
Self bonding	$	1,361.4	$	—	$	—	$	—	$	1,361.4
Surety bonds	325.2		103.8		92.3		11.4		532.7
Bank guarantees	319.8		—		—		117.4		437.2
Letters of credit	17.6		—		34.1		100.9		152.6
	$	2,024.0	$	103.8	$	126.4	$	229.7	$	2,483.9

⁽¹⁾  Other includes the $79.7 million in letters of credit related to Dominion Terminal Associates and the PBGC, as described below, and an additional $150.0 million in bank guarantees, letters of credit and surety bonds related to road maintenance, performance guarantees and other operations.