Pension and Other Post-Retirement Benefits - Expected Benefit Plan Payments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Qualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	$ 28.3
2019	28.0
2020	28.0
2021	27.2
2022	27.0
Years 2029-2033	124.5
Total	263.0
Nonqualified Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	2.5
2019	2.5
2020	2.6
2021	2.7
2022	2.6
Years 2029-2033	11.4
Total	24.3
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2018	1.9
2019	1.8
2020	1.7
2021	1.5
2022	1.3
Years 2029-2033	5.2
Total	$ 13.4