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Defined Benefit Plans - Fair Value of Pension Assets by Major Category of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 677.2	$ 599.6
Group annuity/insurance contracts (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	24.2	23.6	$ 23.3
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	7.8	7.7
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	245.3	197.7
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	355.0	324.6
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	23.2	22.0
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension assets	$ 21.7	$ 24.0

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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
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-SubTopic 20
-Section 50
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