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Retirement Plans - Components of Net Periodic Pension Benefit Cost and Other Changes in Plan Assets and Obligations Recognized in Earnings and Other Comprehensive Earnings (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net periodic pension cost: |  |  |
Service cost | $ 0.8 | $ 1.6 | $ 0.8
Interest cost on benefit obligation | 8.0 | 9.8 | 9.3
Expected return on plan assets | (16.4) | (14.8) | (16.0)
Amortization of net loss | 6.2 | 7.0 | 4.9
Net periodic benefit cost | (1.4) | 3.6 | (1.0)
Other changes in plan assets and obligations recognized in other comprehensive earnings: |  |  |
Net loss incurred | 4.7 | 0.8 | 17.2
Amortization of net loss | (6.2) | (7.0) | (4.9)
Total recognized in other comprehensive loss | (1.5) | (6.2) | 12.3
Total recognized in net periodic pension cost and other comprehensive loss | (2.9) | (2.6) | 11.3
Estimated amortization for the following year: |  |  |
Amortization of net loss | $ 5.8 | $ 6.1 | $ 7.2

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