XML 124 R87.htm IDEA: XBRL DOCUMENT v3.24.0.1
Pension - Schedule of Net Periodic Benefit Cost (Detail) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Periodic Benefit Cost      
Service cost $ 0.7 $ 1.2 $ 1.5
Interest cost 13.6 9.8 9.0
Expected return on plan assets (13.8) (13.3) (18.3)
Amortization of prior service cost (0.1) 0.2 0.1
Amortization of net loss 1.5 0.5 0.7
Curtailments 0.3 (1.0) 0.0
Net periodic benefit cost (income) $ 2.2 $ (2.6) $ (7.0)