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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 |  |  |
2016 | $ 4.4 |  |
2017 | 14.0 |  |
2018 | 1.2 |  |
2019 | 1.2 |  |
2020 | 12.5 |  |
2021-2025 | 12.2 |  |
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2016 |  |  |
Actuarial loss | 1.4 |  |
Total | 1.4 |  |
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 |  |  |
2016 | 3.8 |  |
2017 | 4.0 |  |
2018 | 4.2 |  |
2019 | 4.5 |  |
2020 | 4.7 |  |
2021-2025 | 26.7 |  |
Amounts in accumulated other comprehensive loss that are expected to be recognized as components of net periodic benefit cost during 2016 |  |  |
Actuarial loss | 1.5 |  |
Prior service (credit) cost | 0.3 |  |
Total | $ 1.8 |  |
Supplemental Bonus Plan |  |  |
General disclosures of the plan |  |  |
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 | 90,725 |  |
Aggregate obligation to the plan acquired | $ 5.3 |  |
(Income) expense from mark to market adjustments | $ (0.2) | $ (1.3) | $ 1.5

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