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Employee Benefits - Postretirement Plan and Summary Information for All Defined Benefit Plans (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2006 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplemental Executive Retirement Plans |  |  |  |
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods |  |  |  |
2019 |  | $ 1.1 |  |
2020 |  | 13.9 |  |
2021 |  | 1.1 |  |
2022 |  | 7.9 |  |
2023 |  | 1.0 |  |
2024-2028 |  | 4.4 |  |
Defined Benefit Plans |  |  |  |
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods |  |  |  |
2019 |  | 4.3 |  |
2020 |  | 4.4 |  |
2021 |  | 4.7 |  |
2022 |  | 4.9 |  |
2023 |  | 5.2 |  |
2024-2028 |  | $ 27.9 |  |
Supplemental Bonus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of the entity to be contributed to the plan as a result of acquisition | 258,006 |  |  |
Share liability to the plan to be settled in cash |  | 65,955 |  |
Cash equivalent of share liability to the plan |  | $ 4.7 |  |
Expense (income) from mark to market adjustment |  | $ (0.8) | $ 0.6 | $ 2.1

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