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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 784.9	$ 677.2
Group annuity/insurance contracts (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	24.8	24.2	$ 23.6
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	16.0	7.8
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	287.6	245.3
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	410.0	355.0
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	24.6	23.2
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 21.9	$ 21.7

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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