Pensions and Other Postretirement Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
United States
Defined Benefit Plan Disclosure [Line Items]
Accrued postretirement liability	$ 83.2
Canada
Defined Benefit Plan Disclosure [Line Items]
Accrued postretirement liability	$ 1.2
United States Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of consolidated pension plan assets	48.00%
Percent of consolidated pension plan obligations	45.00%