Pension Benefits and Postretirement Benefits Other Than Pensions - Pension Income (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Interest Cost on Projected Benefit Obligation	$ 1.5	$ 2.2	$ 8.4	$ 6.5
Expected Return on Plan Assets	(1.4)	(1.9)	(7.9)	(5.6)
Amortization of Prior Service Credit	0.1	0.2	0.4	0.5
Amortization of Net Actuarial Loss	0.0	0.4	0.0	1.3
Defined Benefit Plan, Plan Assets, Payment for Settlement	70.2	0.0	70.2	0.0
Total Pension Expense	$ 70.4	$ 0.9	$ 71.1	$ 2.7