Pension and Post-Retirement Benefits - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Pension Plans, Postretirement and Other Employee Benefits
Projected benefit obligation, nonqualified pension plan	$ 1.6	$ 1.5
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate accumulated benefit obligation	1.6	1.5
Fair value of plan assets, nonqualified pension plan	0.0	0.0
Defined benefit plan, accumulated other comprehensive income net gains (losses), after tax	22.1	17.6
Defined benefit plan, accumulated other comprehensive income net prior service cost (credit), after tax	$ 2.2	$ 2.8
Number of multiemployer defined benefit plans \| plan	3
Percentage of contributions to individual multiemployer pension funds	5.00%	5.00%	5.00%
Company contributing percentage on defined benefit plan (up to)	50.00%
Employee contribution over defined benefit plan	4.00%
Company contributions to defined contribution plan	$ 6.1	$ 2.6	$ 3.0
Certain Employees
Pension Plans, Postretirement and Other Employee Benefits
Company contribution over defined benefit plan	4.00%
Some Employees
Pension Plans, Postretirement and Other Employee Benefits
Employee contribution over defined benefit plan	6.00%
Company contribution on profit sharing match	100.00%
Pension Benefits
Pension Plans, Postretirement and Other Employee Benefits
Accumulated benefit obligation	$ 148.5	$ 138.9
Expected contributions to the plans for next fiscal year	$ 5.1
Weighted average discount rate used to determine projected pension and post-retirement obligations	3.20%	4.40%
Post-retirement Benefits
Pension Plans, Postretirement and Other Employee Benefits
Expected contributions to the plans for next fiscal year	$ 1.4
Weighted average discount rate used to determine projected pension and post-retirement obligations	3.20%	4.30%

Defined contribution plan employer over matching contribution percent.

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- Definition

Defined contribution plan percent of employee salary matched.

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- Definition

Number of Multiemployer Plans

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- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

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- Definition

Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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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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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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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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- Definition

Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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- Definition

Amount of cost for defined contribution plan.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

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- Definition

Percentage of contributions required of employer under collective bargaining arrangement to total contributions required under all collective bargaining arrangements for pension and other postretirement plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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