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Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Provisions charged from operations for the profit sharing plan and retirement savings plans | $ 36.3 | $ 39.9 | $ 42.9
Contribution of common stock to profit sharing plan (in shares) | 538,524 | 502,519 | 830,600
Defined benefit pension plan corridor rate | 10.00% |  |
Percentage of equity allocation, maximum | 65.00% |  |
Percentage of fixed income allocation, minimum | 35.00% |  |
Plan assets | $ 668.7 | $ 776.2 | $ 771.8
Expected benefits paid | 39.9 |  |
Bulk Annuity Contract [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 112.0 |  |
Minimum | Equity Security |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment target asset allocation | 40.00% |  |
Minimum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment target asset allocation | 50.00% |  |
Maximum | Equity Security |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment target asset allocation | 50.00% |  |
Maximum | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment target asset allocation | 60.00% |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution | $ 17.0 |  |
Expected benefits paid | $ 3.0 |  |

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