Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 5.6	$ 5.0	$ 16.8	$ 15.2
Expected Return on Plan Assets	(7.6)	(7.3)	(22.9)	(21.7)
Amortization of Net Actuarial Loss	0.7	1.1	2.2	3.2
Total Pension Benefit Recognized	$ (1.3)	$ (1.2)	$ (3.9)	$ (3.3)