Employee Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Components of Net Retirement Cost
Service cost	$ 0.1	$ 0.3
Interest	5.0	4.7
Expected return on plan assets	(7.7)	(6.6)
Amortization of actuarial loss	0.3	1.2
Defined benefit expense	(2.3)	(0.4)
Profit sharing	3.7	3.1
Net expense	$ 1.4	$ 2.7