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Defined Benefit Plans - Components of Net Periodic Benefit Income for Pension Benefits (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Recognition of actuarial losses			$ 1.1	$ 0.6
Net Periodic Benefit Cost [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.1	$ 0.1	0.3	0.3
Interest cost	6.0	7.0	18.0	21.2
Expected return on plan assets	(8.7)	(8.1)	(26.2)	(24.5)
Recognition of actuarial losses	1.1	0.6	1.1	0.6
Net periodic benefit income	$ (1.5)	$ (0.4)	$ (6.8)	$ (2.4)

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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-Publisher FASB
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-Section 50
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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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