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Employee Benefit Plans - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
SERPs |
Defined Benefit Plan Disclosure [Line Items] |
Contributions to benefit plan | $ 0.3
Estimated future contributions | 1.0
Defined benefit plans |
Defined Benefit Plan Disclosure [Line Items] |
Contributions to benefit plan | 1.7
Estimated future contributions | $ 16.9

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