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Employee Benefits - Postretirement Plan and Summary Information for All Defined Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 |  |  |
2017 | $ 14.8 |  |
2018 | 1.2 |  |
2019 | 1.2 |  |
2020 | 12.7 |  |
2021 | 1.1 |  |
2022-2026 | 12.1 |  |
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2017 |  |  |
Actuarial loss | 1.1 |  |
Total | 1.1 |  |
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 |  |  |
2017 | 4.0 |  |
2018 | 4.2 |  |
2019 | 4.5 |  |
2020 | 4.6 |  |
2021 | 4.8 |  |
2022-2026 | 27.5 |  |
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2017 |  |  |
Actuarial loss | 1.5 |  |
Prior service cost | 0.3 |  |
Total | $ 1.8 |  |
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 |  |
Number of shares equivalent to the cash liability associated with post-employment liability | 82,354 |  |
Aggregate obligation to the plan acquired | $ 6.6 |  |
Expense (income) from mark to market adjustment | $ 2.1 | $ (0.2) | $ (1.3)

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