Financial Instruments and Derivative Financial Instruments (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 CAD	Dec. 31, 2011 USD ($)	Dec. 31, 2011 CAD	Dec. 31, 2012 Accounts Receivable Credit Concentration Risk customer	Dec. 31, 2011 Accounts Receivable Credit Concentration Risk
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Long-term debt excluding capital leases	$ 166.8		$ 146.1
Long-term debt book value	166.0		145.3
Notional amount of foreign currency derivatives		10.5		15.6
Foreign currency derivatives at fair value, net	(0.1)		0.4
Cash flow hedge gain (loss) to be reclassified within twelve months	0.1
Fair value of all interest rate swap agreements, net	(0.5)		(1.5)
Interest rate cash flow hedge gain (loss) to be reclassified during next twelve months	$ (0.3)
Concentration Risk [Line Items]
Number of major customers					5
Concentration risk, percentage					48.80%	49.00%