Employee Benefit Plans Defined Contribution Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Salaried Savings Plan [Member]
Defined Contribution Plans, Maximum Company Match, Salaried Voluntary Savings Plan	50.00%
Defined Contribution Plans, Salaried Voluntary Savings Plan, Matching Contributions During the Period	$ 3.3	$ 3.2	$ 3.1
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range	10.00%
Annual Retirement Contribution (ARC) [Member]
Defined Contribution Plans, ARC, Hourly Associates, Contributions Made to During Period	1.6	1.9	1.8
Defined Contribution Plan, Employer Matching Contribution, Percent	3.00%
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range	5.00%
Defined Contribution Plans, ARC, Contributions Made During Period	4.4	3.6	3.5
Hourly Voluntary Savings Plan [Member]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	25.00%
Defined Contribution Plans, Hourly Voluntary Savings Plan, Matching Contributions During the Period	$ 0.1	$ 0.2	$ 0.2
Defined Contribution Plans, ARC, Range of Percentage of Salary Eligible for Contribution, Low End of Range	6.00%