Employee Retirement Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Benefit Plans Disclosures [Line Items]
Unfunded status of plans	$ 102.4	$ 74.2
Plan assets expected to be returned	0
Prior service cost included in AOCL	0.2
Prior service cost included in AOCL, net of tax	0.1
Unrecognized actuarial losses included in AOCL	156.9
Unrecognized actuarial losses included in AOCL, net of tax	98.7
Actuarial loss expected to be recognized in net periodic pension cost	4.8
Actuarial loss expected to be recognized in net periodic pension cost, net of tax	3.0
Expected full year contribution by the employer to defined benefit plans	18.9
Actual employer contributions to defined benefit plans	17.3	15.4
Expected full year contribution by the employer to 401(k) plan and Supplemental Profit Sharing Plan	11.9
Actual contribution to defined contribution and profit sharing plans by the employer	$ 9.3	$ 8.2	$ 7.9
Minimum
Schedule of Benefit Plans Disclosures [Line Items]
Company contribution to the Profit Sharing Plan	1.00%
Maximum
Schedule of Benefit Plans Disclosures [Line Items]
Company contribution to the Profit Sharing Plan	3.00%