Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 4.5	$ 5.5
Expected Return on Plan Assets	(7.3)	(7.6)
Amortization of Net Actuarial Loss	1.5	0.7
Total Pension Benefit Recognized	$ (1.3)	$ (1.4)