Income Tax Matters, Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Dec. 31, 2010
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
The foreign currency impact on unrecognized tax benefits, interest and penalties resulted in a increase to currency translation adjustment			$ 0.5
Income Tax Matters (Textuals) [Abstract]
Income tax provision	0.7	0.4	10.2	7.7
Effective tax rate			33.50%
Decrease in valuation allowance due to change in tax law			0.8
Decrease in effective tax rate due to change in valuation allowance			2.70%
Decrease in unrecognized tax benefit, interest and penalty expense			0.4
Decrease in effective tax rate due to unrecognized tax benefits including interest and penalty			1.50%
Decrease in income tax provision due to a return to provision adjustment			0.2
Decrease in effective tax rate due to a return to provision adjustment			0.70%
Non-deductible compensation expense			0.2
Increase in effective tax rate due to non-deductible compensation expense			0.50%
Net operating loss carryforwards						882.6
NOL carry forwards relates to the excess tax benefits from employee restricted stock						1.7
Alternate minimum tax						31.1
Valuation allowance against deferred tax assets	19.3		19.3			20.1
Canadian provincial income tax assessment settlement					7.9
Additional Canadian income tax assessment	1.1		1.1			1.1
Unrecognized tax benefits	13.8		13.8			15.0
Accrued Interest and penalties related to these unrecognized tax benefits	6.4		6.4			6.6
Accrued interest and penalties related to these unrecognized tax benefits current	0.4		0.4			0.4
Decrease in accrued interest and penalties			0.2	0
Decrease in unrecognized tax benefit due to the resolution of certain tax audits and expirations of various statutes of limitation	0.7		0.7
Anticipated payment period of Canadian Provincial income tax assessment	12 months		12 months
Expected period which unrecognized tax benefits will be reduced	12 months		12 months
FIN 48 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
The foreign currency impact on unrecognized tax benefits, interest and penalties resulted in a increase to currency translation adjustment			$ 0.6