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Benefit Plans (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) plan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Retirement Benefits [Abstract] |  |  |
Employer discretionary contribution amount | $ 5.9 | $ 4.9 | $ 4.4
Number of non-contributory defined benefit pension plans | plan | 2 |  |
Period of average compensation for pension benefit computation | 5 years |  |
Age limit for a lump sum payment | 55 years |  |
Deferred compensation arrangement with Individual, recorded liability | $ 8.3 |  |
Long-term portion of the pension liability | 32.1 | 33.9 |
AOCI net prior service cost | 5.0 |  |
Future amortization of prior service cost | $ 0.2 |  |
Retirement age | 65 years |  |
Rabbi trust balance | $ 20.9 |  |
Expense related to contributions | 0.1 |  |
Total deferred compensation liability | 21.2 | 21.4 |
Deferred compensation liability, current | $ 1.7 | $ 1.4 |

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