Derivative Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Derivative [Line Items]
Derivative, Notional Amount	$ 11.0	$ 5.0	$ 8.6
Foreign currency derivatives at fair value, net (less than $0.1 million at December 31, 2013)	0.1		0.2
Cash flow hedge gain (loss) to be reclassified within twelve months	0.1
HBB
Derivative [Line Items]
Derivative, Notional Amount	20.0	20.0	25.0
Fair value of all interest rate swap agreements, net	0.6	0.8	0.2
Interest rate cash flow hedge gain (loss) to be reclassified during next twelve months	0.1
NACoal
Derivative [Line Items]
Derivative, Notional Amount	100.0	100.0
Fair value of all interest rate swap agreements, net	0.1	0.1
Interest rate cash flow hedge gain (loss) to be reclassified during next twelve months	$ 0.1