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, 2022 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) net of tax, beginning balance	$ (165.1)
Accumulated other comprehensive income (loss) net of tax, ending balance	(163.7)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) net of tax, beginning balance	(49.1)
Other comprehensive income before reclassifications	(0.7)
Net current-period other comprehensive income	(0.7)
Accumulated other comprehensive income (loss) net of tax, ending balance	(49.8)
Benefit Plan Liabilities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) net of tax, beginning balance	(114.5)
Amounts reclassified from accumulated other comprehensive income into net income	0.9
Net current-period other comprehensive income	0.9
Accumulated other comprehensive income (loss) net of tax, ending balance	(113.6)
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) net of tax, beginning balance	(1.5)
Amounts reclassified from accumulated other comprehensive income into net income	1.2
Net current-period other comprehensive income	1.2
Accumulated other comprehensive income (loss) net of tax, ending balance	$ (0.3)