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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.8	$ 3.0
Interest cost	3.5	3.6
Expected return on plan assets	(3.2)	(3.4)
Amortization of prior service cost	0.1	0.1
Recognized actuarial losses	3.4	3.5
Total	$ 6.6	$ 6.8

X

- Definition

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

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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

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