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Retirement Plans (Retirement Savings Plan) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Savings Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 17.0 | $ 15.8 | $ 15.8

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- Details
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