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Employee Benefit and Retirement Plans - Schedule of Company's Pension Cost And Supplemental Retirement Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0.5 | $ 0.8 | $ 2.8
Interest cost | 49.1 | 46.4 | 49.6
Expected return on plan assets | 59.2 | 67.5 | 73.3
Prior service cost (credit) | (0.1) | (0.1) | (0.1)
Net actuarial loss | (15.5) | (21.4) | (23.7)
Curtailment, settlement and termination (benefit) costs |  | 0.0 | 3.7
Total expense (income) | $ 5.8 | $ 1.0 | $ (1.0)
Effective discount rate for benefit obligations | 4.12% | 3.48% | 3.99%
Effective rate for interest on benefit obligations | 3.79% | 3.09% | 3.28%
Effective rate for service cost | 3.93% | 3.32% | 3.83%
Effective rate for interest on service cost | 3.62% | 2.98% | 3.38%
Long-term rate of return on plan assets | 5.25% | 5.75% | 6.04%
Long-term rate of compensation increase | 3.00% | 2.54% | 2.50%
Pension Benefits | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 6.5 | $ 6.3 | $ 7.3
Interest cost | 12.6 | 13.1 | 13.4
Expected return on plan assets | 13.0 | 14.9 | 18.4
Prior service cost (credit) | 0.5 | 0.4 | 0.4
Net actuarial loss | (1.8) | (2.0) | (2.0)
Curtailment, settlement and termination (benefit) costs | (0.6) | (1.3) | (1.3)
Total expense (income) | $ 9.0 | $ 8.2 | $ 6.0
Effective discount rate for benefit obligations | 2.52% | 2.24% | 2.10%
Effective rate for interest on benefit obligations | 2.20% | 1.94% | 1.70%
Effective rate for service cost | 1.89% | 2.33% | 2.44%
Effective rate for interest on service cost | 2.24% | 2.27% | 2.38%
Long-term rate of return on plan assets | 2.47% | 2.58% | 3.20%
Long-term rate of compensation increase | 2.32% | 3.47% | 3.53%
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0.2 | $ 0.3 | $ 0.1
Interest cost | 1.8 | 1.8 | 2.2
Prior service cost (credit) | (4.9) | (6.6) | (5.2)
Net actuarial loss | 4.5 | 3.6 | 3.9
Total expense (income) | $ (7.4) | $ (8.1) | $ (6.8)
Effective discount rate for benefit obligations | 3.90% | 3.09% | 3.76%
Effective rate for interest on benefit obligations | 2.71% | 2.71% | 3.07%
Effective rate for service cost | 2.97% | 2.98% | 3.25%
Effective rate for interest on service cost | 2.78% | 2.78% | 3.02%

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