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Defined Benefit Pension Plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.6	$ 3.2	$ 7.4	$ 6.4
Interest cost	2.4	3.0	4.8	5.9
Expected return on plan assets	(3.4)	(2.8)	(6.8)	(5.5)
Amortization of prior service cost	0.1	0.1	0.1	0.1
Recognized actuarial losses	5.6	4.7	11.0	9.4
Total	$ 8.3	$ 8.2	$ 16.5	$ 16.3

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

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