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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.

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- References

No definition available.

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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- Definition

Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.

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Employee Retirement Plans (Plan Assets and Investment Strategy) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 436.8	$ 393.8	$ 454.8
Debt securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation percentage of assets	70.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Actual plan asset allocations	70.00%
Equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target allocation percentage of assets	30.00%
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Actual plan asset allocations	30.00%
Redemption Notice Period \| JP Morgan Chase Bank Strategic Property Fund
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	30 days	45 days
Redemption Notice Period \| Pyramis Long Corporate A or Better
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	15 days	15 days
Redemption Notice Period \| Pyramis Long Duration
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	15 days	15 days
Redemption Notice Period \| Russell 3000 Index NL
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period	1 day	1 day
Redemption Notice Period \| Russell 1000 Index NL
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Redemption notice period		1 day
Fair Value, Recurring
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 289.9	$ 250.8
Fair Value, Recurring \| JP Morgan Chase Bank Strategic Property Fund
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	12.6	18.0
Fair Value, Recurring \| Pyramis Long Corporate A or Better
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	93.3	78.6
Fair Value, Recurring \| Pyramis Long Duration
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	92.2	79.2
Fair Value, Recurring \| Russell 3000 Index NL
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	91.8	75.0
Fair Value, Recurring \| Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	1.9	2.7
Fair Value, Recurring \| Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	145.0	140.3
Fair Value, Recurring \| Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Cash and cash equivalents
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	1.9	2.7
Fair Value, Recurring \| Cash and cash equivalents \| Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	1.9	2.7
Fair Value, Recurring \| Cash and cash equivalents \| Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Cash and cash equivalents \| Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Debt securities
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	118.0	113.9
Fair Value, Recurring \| Debt securities \| Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Debt securities \| Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	118.0	113.9
Fair Value, Recurring \| Debt securities \| Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Equity securities
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	27.0	26.4
Fair Value, Recurring \| Equity securities \| Level 1
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Equity securities \| Level 2
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	27.0	26.4
Fair Value, Recurring \| Equity securities \| Level 3
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	0.0	0.0
Fair Value, Recurring \| Pension Plan Assets, Excluding Investments Measured At NAV
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Fair value of plan assets	$ 146.9	$ 143.0