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Retirement Benefits (Details 6) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent assets | $ 12.5 | $ 25.0
Current liabilities | (5.7) | (5.7)
Noncurrent liabilities | (225.6) | (415.4)
Total amount recognized | (218.8) | (396.1)
Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent assets | 0.0 | 0.0
Current liabilities | (27.8) | (29.2)
Noncurrent liabilities | (184.9) | (258.1)
Total amount recognized | $ (212.7) | $ (287.3)

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