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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Service cost $ 0.8 $ 1.7 $ 1.5
Interest cost on benefit obligation 9.3 10.0 10.8
Expected return on plan assets (16.0) (14.0) (14.6)
Amortization of net loss 4.9 5.0 5.3
Net periodic benefit cost (1.0) 2.7 3.0
Net loss incurred 17.2 0.8 1.4
Amortization of net loss (4.9) (5.0) (5.3)
Total recognized in other comprehensive loss 12.3 (4.2) (3.9)
Total recognized in net periodic pension cost and other comprehensive loss 11.3 (1.5) (0.9)
Amortization of net loss $ 7.2 $ 5.0 $ 5.5