Stockholders' Equity, Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	$ 0.2	$ 0.0	$ 0.2	$ 0.1
Interest Rate Swaps [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized swap interest	0.7		0.6		$ 1.4	$ 1.1
Tax benefit	(0.2)		(0.2)		(0.2)	(0.3)
Net of tax	0.5		0.4		1.2	0.8
Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Actuarial Loss [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	0.7		2.5		1.2	4.9
Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Pension Settlement [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI			0.2		0.1	0.4
Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Prior Service Credits [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	(0.1)		(0.1)		(0.1)	(0.2)
Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of AOCI	0.6		2.6		1.2	5.1
Tax expense (benefit)	(0.4)		(0.6)		(0.3)	(1.1)
Net of tax	$ 0.2		$ 2.0		$ 0.9	$ 4.0