Income Tax Matters, Tax Uncertainties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Payment relating to Canadian Provincial income tax assessment	$ 1.3
Reconciliation of changes in the gross unrecognized tax benefits:
Gross unrecognized tax benefits at beginning of period		13.7	15.0	15.6
Gross increases for tax positions of prior years		1.3	0.1	0
Gross decreases for tax positions of prior years		(0.1)	0	0
Gross increases for tax positions of current years		0.4	0.4	0.4
Settlements		0	(0.5)	0
Gross decrease for tax positions relating to lapse of a statute of limitation		0	(0.9)	(1.7)
Foreign currency translation		0.4	(0.4)	0.7
Gross unrecognized tax benefits at end of period	13.7	15.7	13.7	15.0
Unrecognized tax benefits that would impact effective tax rate if recognized		14.6
Unrecognized tax benefits, income tax penalties and interest accrued:
Accrued interest and penalties on unrecognized tax benefits	6.6	7.5	6.6
Accrued interest and penalties on unrecognized tax benefits, current	0	0	0
Increase in interest and penalty		0.9	0	0.4
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which (decreased) increased Other comprehensive income		(0.2)	0.2	(0.5)
Expected gross unrecognized tax benefits to be reduced within the next 12 months		3.6
Expected period which gross unrecognized tax benefits will be reduced		12 months
FIN 48
Unrecognized tax benefits, income tax penalties and interest accrued:
Foreign currency impact on gross unrecognized tax benefit (including interest and penalties) which (decreased) increased Other comprehensive income		$ (0.5)	$ 0.3	$ (0.6)