Business Segments (Textual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Management fees expense	$ 6.9	$ 7.2	$ 8.2
Hyster-Yale
Segment Reporting Information [Line Items]
Management fees expense	$ 9.6	$ 9.7	$ 7.8
Choctaw Generation Limited Parnership [Member] | NACoal
Segment Reporting Information [Line Items]
Revenue from major customer, percentage	56.00%	77.00%	49.00%
San Miguel Electric Cooperative [Member] | NACoal
Segment Reporting Information [Line Items]
Revenue from major customer, percentage			29.00%
Wal-Mart [Member] | HBB
Segment Reporting Information [Line Items]
Revenue from major customer, percentage	31.00%	30.00%	36.00%
Five Largest Customers [Member] | HBB
Segment Reporting Information [Line Items]
Revenue from major customer, percentage	53.00%	50.00%	55.00%