Benefit Plans - Plan Assets Using Fair Value Methodologies (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 27.4
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	30.5
Fair value of plan assets end of year	27.4
Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	14.4
Fair value of plan assets end of year	8.3
Total | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.2
Fair value of plan assets end of year	0.3
Total | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	14.2
Fair value of plan assets end of year	8.0
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.2
Fair value of plan assets end of year	0.3
Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.2
Fair value of plan assets end of year	0.3
Level 1 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.0
Fair value of plan assets end of year	0.0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.0
Fair value of plan assets end of year	0.0
Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.0
Fair value of plan assets end of year	0.0
Level 2 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.0
Fair value of plan assets end of year	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	14.2
Actual return on plan assets	0.5
Company contributions	0.7
Benefits received	0.3
Settlement	(6.8)
Foreign currency translation	(0.9)
Fair value of plan assets end of year	8.0
Level 3 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	0.0
Fair value of plan assets end of year	0.0
Level 3 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.0
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	14.2
Fair value of plan assets end of year	8.0
Investments measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19.1
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets beginning of year	16.1
Fair value of plan assets end of year	$ 19.1