Income Tax Matters, Tax Uncertainties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of changes in the gross unrecognized tax benefits:
Gross unrecognized tax benefits	$ 15.0	$ 15.6	$ 15.8
Gross increases for tax positions of prior years	0.1	0	1.6
Gross decreases for tax positions of prior years	0	0	(1.6)
Gross increases for tax positions of current years	0.4	0.4	0.4
Settlements	(0.5)	0	(2.8)
Gross decrease for tax positions relating to lapse of a statute of limitation	(0.9)	(1.7)	0
Foreign currency translation	(0.4)	0.7	2.2
Gross unrecognized tax benefits	13.7	15.0	15.6
Unrecognized tax benefits, income tax penalties and interest accrued:
Payment relating to Canadian Provincial income tax assessment	1.3		7.9
Increase (decrease) in interest and penalty	0	0.4	(3.2)
Accrued interest and penalty on unrecognized tax benefits	6.6	6.6
Accrued interest and penalty on unrecognized tax benefits, current	0	0.4
Foreign currency impact on gross unrecognized tax benefit including interest and penalty	0.2	(0.5)	(1.5)
FIN 48 [Member]
Unrecognized tax benefits, income tax penalties and interest accrued:
Foreign currency impact on gross unrecognized tax benefit including interest and penalty	$ 0.3	$ (0.6)	$ (2.7)