Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 5.7	$ 5.1	$ 11.2	$ 10.2
Expected Return on Plan Assets	(7.7)	(7.2)	(15.3)	(14.4)
Amortization of Net Actuarial Loss	0.8	1.1	1.5	2.1
Total Pension Benefit Recognized	$ (1.2)	$ (1.0)	$ (2.6)	$ (2.1)