Pension and Other Post-Retirement Benefits (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension [Member]
Components of pension and other post retirement benefit costs
Service cost	$ 6.7	$ 5.7	$ 5.4
Interest cost	18.4	19.7	20.7
Expected return on plan assets	(27.5)	(29.6)	(33.2)
Amortization of unrecognized prior service credit	(1.0)	(1.0)	(1.0)
Unrecognized net actuarial loss (gain)	14.9	9.9	7.2
Net periodic (benefit) cost	11.5	4.7	(0.9)
Retiree Health and Life [Member]
Components of pension and other post retirement benefit costs
Service cost	0.2	0.2	0.2
Interest cost	1.6	2.0	2.2
Expected return on plan assets	0	0	0
Amortization of unrecognized prior service credit	(0.1)	(0.1)	(0.1)
Unrecognized net actuarial loss (gain)	0	(0.1)	(0.3)
Net periodic (benefit) cost	$ 1.7	$ 2.0	$ 2.0