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Benefit Plans, Amounts Recognized in Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amounts recognized in Balance Sheet [Abstract] |  |
Current liability | $ (60.3) | $ (50.7)
Non-current liability | (179.0) | (148.9)
Pension Benefits [Member] |  |
Amounts recognized in Balance Sheet [Abstract] |  |
Current liability | (1.4) | (1.1)
Non-current liability | (174.7) | (143.3)
Recognized liability | (176.1) | (144.4)
Post-Retirement Benefits [Member] |  |
Amounts recognized in Balance Sheet [Abstract] |  |
Current liability | (0.3) | (0.4)
Non-current liability | (4.3) | (5.5)
Recognized liability | $ (4.6) | $ (5.9)

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