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Defined Benefit Plans - Defined Benefit Plans Narrative (Details) - Pension Plans, Defined Benefit [Member] $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0.2 | $ 0.9
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year | $ 2.3 | $ 2.3

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