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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 816.0	$ 784.9
Group annuity/insurance contracts (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	25.5	24.8	$ 24.2
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	10.5	16.0
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	221.1	287.6
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	512.1	410.0
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	22.0	24.6
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 24.8	$ 21.9

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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