Employee Benefits (Narrative) (Details) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Retirement Plans
Company contribution	$ 12.9
Projected annual contribution to retirement plans	13.9
Other Postretirement Benefits
Company contribution to postretirement benefit plan	$ 2.2

The amount of contributions made by the employer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration