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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.5	$ 2.7	$ 9.9	$ 8.3
Interest cost	2.7	3.5	7.9	10.5
Expected return on plan assets	(2.4)	(3.1)	(7.0)	(9.3)
Amortization of prior service cost	0.1	0.1	0.2	0.2
Recognized actuarial losses	4.6	3.3	13.3	10.0
Total	$ 8.5	$ 6.5	$ 24.3	$ 19.7

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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