v3.26.1
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, 2026
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance $ 753.1
Accumulated other comprehensive income (loss) net of tax, ending balance 1,288.4
Foreign Currency Translation [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance (57.7)
Other comprehensive loss before reclassifications (5.1)
Net current-period other comprehensive loss (5.1)
Accumulated other comprehensive income (loss) net of tax, ending balance (62.8)
Benefit Plan Liabilities [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive income (loss) net of tax, beginning balance (84.0)
Amounts reclassified from accumulated other comprehensive loss into net loss (0.4)
Net current-period other comprehensive loss (0.4)
Accumulated other comprehensive income (loss) net of tax, ending balance $ (84.4)