Other Retirement Plans (Narrative) (Details) (Details) (Multiemployer Plans, Pension [Member], Central States Southeast And Southwest Areas Pension Fund [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Multiemployer Plans, Pension [Member] | Central States Southeast And Southwest Areas Pension Fund [Member]
Multiemployer Plans [Line Items]
Multiemployer plans, withdrawal liability	$ 6.4