Employee Retirement Plans (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of Net Retirement Cost
Service cost	$ 1.1	$ 0.9	$ 0.8
Interest	18.5	19.4	19.6
Expected return on plan assets	(26.6)	(22.9)	(22.8)
Amortization of actuarial loss	4.9	3.2	1.8
Prior service cost	0.1	0.1	0.1
Defined benefit expense	(2.0)	0.7	(0.5)
Profit sharing	12.3	11.9	9.3
Net expense	$ 10.3	$ 12.6	$ 8.8