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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Components of net periodic benefit cost: |  |  |  |
Interest cost | $ 7.0 | $ 4.1 | $ 14.0 | $ 8.1
Net periodic cost (income) | 1.9 | (0.7) | 3.9 | (1.3)
Other post-retirement employee benefit plans |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Interest cost | 0.4 | 0.2 | 0.8 | 0.4
Amortization of net prior service credit and net actuarial gain | (0.1) | (0.1) | (0.2) | (0.2)
Net periodic cost (income) | $ 0.3 | $ 0.1 | $ 0.6 | $ 0.2

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