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Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Settlements | $ 0.0 | $ 1.1 | $ 0.7 | $ 3.4
Pension benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Settlements | $ 0.0 | $ 1.1 | $ 0.7 | $ 3.4

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