Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	THREE MONTHS ENDED						NINE MONTHS ENDED
	SEPTEMBER 30						SEPTEMBER 30
	2012			2011			2012			2011
Income before income taxes:	$	13.6		$	10.3		$	25.2		$	71.4
Statutory taxes at 35%	$	4.8		$	3.6		$	8.8		$	25.0
Discrete items:
Other	(0.3		)	(0.2		)	(0.3		)	(0.4		)
	(0.3		)	(0.2		)	(0.3		)	(0.4		)
Other permanent items:
NACoal percentage depletion	(1.5		)	(0.7		)	(2.4		)	(3.6		)
Foreign tax rate differential	(0.1		)	(0.7		)	(0.1		)	(0.8		)
Other	0.5			0.1			0.7			1.6
	(1.1		)	(1.3		)	(1.8		)	(2.8		)
Income tax provision	$	3.4		$	2.1		$	6.7		$	21.8
Effective income tax rate	25.0		%	20.4		%	26.6		%	30.5		%