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Savings, Pension and Other Postretirement Employee Benefit Plans - Investments at Fair Value for Company Sponsored Pension Benefit Plans Within Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2.4	$ 2.0
defined benefit plan net asset value	0.0	0.0
Common and collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	333.5	304.6
defined benefit plan net asset value	333.5	304.6
Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	335.9	306.6
defined benefit plan net asset value	333.5	304.6
Fair Value, Inputs, Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.4	2.0
Fair Value, Inputs, Level 1 | Common and collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Fair Value, Inputs, Level 1 | Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2.4	$ 2.0

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, measured at their net asset value (NAV) as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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- Definition

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+ References

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- Definition

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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