Defined Benefit Plan, Plan Assets, Reimbursement from CTA

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- Definition

Defined Benefit Plan, Period of Return for Fixed Income Investments From Discount Rate Assumptions

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- Definition

Defined Benefits Plan, Expected Future Reimbursement from CTA, Net Fiscal Year

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- Definition

Amount of gross other benefits from an other postretirement benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Plan Asset Underlying Investment Redemption Notice

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Plan Assets Redemptions per Period

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Amount of increase in plan assets of defined benefit plan from business combination.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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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

Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Amount of cost for defined contribution plan.

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The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

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Benefit Plans Benefit Plans - Textuals (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) years	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 0.0	$ 0.0	$ 3.3
Healthcare cost trend rate assumed for next year	6.50%	6.80%
Year that rate reaches ultimate trend rate	2025	2025
Expected rate of return period	20 years
Cost recognized	$ 10.3	$ 8.2	8.3
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	50.0
Defined Benefits Plan, Expected Future Reimbursement from CTA, Net Fiscal Year	13.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	4.6
Employer contributions	34.5
Benefit Plan, Plan Assets, Reimbursement from CTA	14.6
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Acquired benefit plans and other	0.0	0.0
Curtailment gain	$ 0.0	$ 0.0	0.0
Discount rate	4.34%	3.71%
Actuarial loss (gain)	$ 1.6	$ 0.5
Settlements, plan assets	0.0	0.0
Settlement loss	0.0	0.0	$ 0.0
Employer contributions	0.8	0.8
2018, gross	0.9
Settlements	$ 0.0	0.0
Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Plan Asset Underlying Investment Redemption Notice	1 day
Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Redemptions per Period \| years	0.5
Plan Asset Underlying Investment Redemption Notice	95 days
Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 5.5	$ 5.5
Real estate
Defined Benefit Plan Disclosure [Line Items]
Plan Assets Redemptions per Period \| years	0.25
Plan Asset Underlying Investment Redemption Notice	30 days
Residential [Member] \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	23.00%	21.00%
Long Short Equity [Member] \| Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	44.00%	50.00%
Buyout Private Equity Funds [Member] \| Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	43.00%	42.00%
Special Situation Private Equity and Debt Funds [Member] \| Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	34.00%	25.00%
Venture Private Equity Funds [Member] \| Private equity funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	23.00%	33.00%
Arbitrage and Event Investments [Member] \| Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	54.00%	45.00%
Directional Trading, Fixed Income and Other Investments [Member] \| Multi-strategy hedge funds
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	2.00%	5.00%
Retail [Member] \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	26.00%	27.00%
Industrial, Cash and Other [Member] \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	14.00%	11.00%
Office [Member] \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	37.00%	41.00%
Debt securities \| Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	61.00%	59.00%
Collateralized Mortgage Backed Securities [Member] \| Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	23.00%	15.00%
Corporate Debt Securities [Member] \| Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	51.00%	54.00%
Fixed income securities \| US Treasury and Government [Member] \| Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	26.00%	31.00%
Equity Securities [Member] \| Russell 1000 Fund Large Cap Index Funds [Member] \| Other common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Actual allocation percentage	39.00%	41.00%
NETHERLANDS
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 0.4
Settlements	$ 186.8