Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 4.5	$ 5.7	$ 9.0	$ 11.2
Expected Return on Plan Assets	(7.4)	(7.7)	(14.7)	(15.3)
Amortization of Net Actuarial Loss	1.5	0.8	3.0	1.5
Total Pension Benefit Recognized	$ (1.4)	$ (1.2)	$ (2.7)	$ (2.6)