Derivative Financial Instruments (Details) In Millions, unless otherwise specified			12 Months Ended		12 Months Ended
	Dec. 31, 2013 CAD	Dec. 31, 2012 CAD	Dec. 31, 2013 HBB USD ($)	Dec. 31, 2012 HBB USD ($)	Dec. 31, 2013 NACoal USD ($)	Dec. 31, 2012 NACoal USD ($)
Derivative [Line Items]
Notional amount of interest rate derivatives	5.0	10.5	$ 20.0	$ 25.0	$ 100.0	$ 0
Average fixed interest rate of interest rate derivatives			1.40%	4.00%	1.40%	0.00%
Remaining term			delayed contracts extending to January 2020		extending to May 2018