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Pension and Other Post-Retirement Benefits - Fair Value Pension Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair value of pension plan assets
Assets	$ 328.8	$ 323.8
Short-term investment funds [Member]
Fair value of pension plan assets
Assets	0.7	4.1
Common stock collective funds [Member]
Fair value of pension plan assets
Assets	127.4	97.9
Fixed income collective trust funds [Member]
Fair value of pension plan assets
Assets	193.7	213.1
Real estate investment funds [Member]
Fair value of pension plan assets
Assets	$ 7.0	$ 8.7

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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