v3.25.2
Reclassifications out of Accumulated Other Comprehensive Loss - Summary of Reclassifications out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service cost $ 0.0 $ 0.2 $ 0.0 $ 0.3
Amortization of actuarial net gains $ 0.0 $ 0.0 0.0 (0.1)
Total reclassifications     0.0 (0.1)
Defined Benefit Pension Plan Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications     0.0 (0.1)
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax     0.0 0.2
Income tax expense     0.0 (0.1)
Total reclassifications     0.0 0.1
Reclassification Out of Accumulated Other Comprehensive Income/(Loss) [Member] | Defined Benefit Pension Plan Items [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of prior service cost     0.0 0.3
Amortization of actuarial net gains     $ 0.0 $ (0.1)