v3.25.2
Stockholders' Equity, Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Changes in Accumulated Other Comprehensive Income/(Loss) Net of Tax by Component (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2025
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance $ 815.3
Accumulated other comprehensive income (loss) net of tax, ending balance 811.5
Foreign Currency Translation [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance (67.5)
Other comprehensive income before reclassifications 8.8
Net current-period other comprehensive income (loss) 8.8
Accumulated other comprehensive income (loss) net of tax, ending balance (58.7)
Benefit Plan Liabilities [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance (86.3)
Other comprehensive income before reclassifications 0.1
Amounts reclassified from accumulated other comprehensive loss into net loss (1.3)
Net current-period other comprehensive income (loss) (1.2)
Accumulated other comprehensive income (loss) net of tax, ending balance $ (87.5)