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Employee Benefit Plans (Pensions Plans with Benefit Obligation in Excess of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Pension plans with a benefit obligation in excess of plan assets: |  |
Projected benefit obligation | $ 357.2 | $ 394.4
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 353.4 | 390.4
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets | $ 275.0 | $ 305.9

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