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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Net periodic pension cost:      
Service cost $ 0.5 $ 0.8 $ 1.6
Interest cost on benefit obligation 6.4 8.0 9.8
Expected return on plan assets (17.7) (16.4) (14.8)
Amortization of net loss 5.9 6.2 7.0
Net periodic benefit (income) cost (4.9) (1.4) 3.6
Other changes in plan assets and obligations recognized in other comprehensive earnings:      
Net (gain) loss incurred (19.9) 4.7 0.8
Amortization of net loss (5.9) (6.2) (7.0)
Total recognized in other comprehensive loss (25.8) (1.5) (6.2)
Total recognized in net periodic pension cost and other comprehensive loss $ (30.7) $ (2.9) $ (2.6)