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Retirement Plans - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Additional cash contribution to TRP for the remainder of the year | $ 0 |  |  | $ 0 |
Pension lump-sum payment charge | 1,200,000 | $ 6,300,000 |  |  |
Retirement Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net pension plan obligation | 130,900,000 |  |  | 130,900,000 |
Contributions to plan |  |  |  | 11,100,000 | $ 10,900,000
Pension lump-sum payment charge | 1,198,000 |  | $ 0 | 7,498,000 | 0
SERP |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions to plan |  |  |  | 32,900,000 | $ 7,200,000
Accrued Liabilities | Retirement Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net pension plan obligation | 8,400,000 |  |  | 8,400,000 |
KFMB |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net pension plan obligation | $ 7,300,000 |  |  | $ 7,300,000 |

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