Pension and Other Post-Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Post-Retirement Benefit Plans, Reclassification adjustments into earnings	$ 2.3
Defined Benefit Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.6	$ 1.7
Interest cost	3.9	4.9
Expected return on plan assets	(6.5)	(6.5)
Unrecognized prior service credit	(0.2)	(0.2)
Unrecognized net actuarial loss	2.6	3.5
Net expense	1.4	3.4
Retiree Health and Life [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0
Interest cost	0.3	0.4
Expected return on plan assets	0.0	0.0
Unrecognized prior service credit	(0.1)	0.0
Unrecognized net actuarial loss	0.0	0.0
Net expense	$ 0.2	$ 0.4