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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Summary of Curtailments in Statements of Operations [Table Text Block]
The Company's execution of its 2018 and 2019 strategic initiatives, including divestitures and corporate restructurings, triggered curtailments related to the Pension Plan, SERP and/or Medical Plan at the closing of the various transactions. Refer to Note 8 – Restructuring for more information. Curtailments were included in "Interest and other income (expense)" and "Net gain (loss) from asset sales, inclusive of restructuring costs" on the statements of operations depending on the associated participants triggering the curtailment and are summarized in the following table:
Year ended December 31,
Statements of Operations Line202020192018
Interest and other income (expense)$— $(1.4)$(0.3)
Net gain (loss) from asset sales, inclusive of restructuring costs— 0.2 0.2 
Total curtailment gain (loss)$— $(1.2)$(0.1)
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The following table sets forth changes in the benefit obligations and fair value of plan assets for the Company's Pension Plan, SERP and Medical Plan for the years ended December 31, 2020 and 2019, as well as the funded status of the plans and amounts recognized in the financial statements at December 31, 2020 and 2019:
Pension Plan and SERP benefitsMedical Plan benefits
2020201920202019
Change in benefit obligation(in millions)
Benefit obligation at January 1,$135.2 $122.1 $2.6 $2.5 
Service cost— 0.3 — — 
Interest cost4.1 4.8 0.1 0.1 
Curtailments— 1.2 — — 
Benefit payments(10.3)(6.2)(0.7)(0.9)
Plan amendments— — — — 
Actuarial loss (gain)11.7 13.0 0.7 0.9 
Settlement loss(5.4)— — — 
Benefit obligation at December 31,$135.3 $135.2 $2.7 $2.6 
Change in plan assets
Fair value of plan assets at January 1,$113.9 $93.3 $— $— 
Actual return on plan assets16.1 21.3 — — 
Company contributions to the plan13.7 5.5 0.7 0.9 
Benefit payments(10.3)(6.2)(0.7)(0.9)
Settlement loss(5.4)— — — 
Fair value of plan assets at December 31,128.0 113.9 — — 
Underfunded status (current and long-term)$(7.3)$(21.3)$(2.7)$(2.6)
Amounts recognized in balance sheets
Accounts payable and accrued expenses$(3.1)$(9.2)$(0.1)$(0.2)
Other long-term liabilities(4.2)(12.1)(2.6)(2.4)
Total amount recognized in balance sheet$(7.3)$(21.3)$(2.7)$(2.6)
Amounts recognized in AOCI
Net actuarial loss (gain)$15.4 $15.7 $1.0 $0.4 
Prior service cost— — — — 
Total amount recognized in AOCI$15.4 $15.7 $1.0 $0.4 
Pension and Other Postretirement Benefit Costs
The following table sets forth the Company's Pension Plan, SERP and Medical Plan cost and amounts recognized in other comprehensive income (before tax) for the respective years ended December 31:
Pension Plan and SERP benefitsMedical Plan benefits
202020192018202020192018
Components of net periodic benefit cost(in millions)
Service cost$— $0.3 $0.8 $— $— $— 
Interest cost4.1 4.8 4.6 0.1 0.1 0.1 
Expected return on plan assets(6.1)(5.9)(5.8)— — — 
Curtailment (gain) loss— 2.0 0.3 — (0.8)(0.2)
Settlement loss1.0 — — — — — 
Amortization of prior service costs— 0.4 0.8 — — (0.3)
Amortization of actuarial loss0.9 0.5 0.8 — — — 
Periodic expense$(0.1)$2.1 $1.5 $0.1 $(0.7)$(0.4)
Components recognized in accumulated other comprehensive income
Current period prior service cost$— $— $— $— $— $0.2 
Current period actuarial (gain) loss1.6 (2.4)5.6 0.7 0.9 (0.1)
Amortization of prior service cost— (0.4)(0.8)— 0.8 0.3 
Amortization of actuarial gain (loss)(0.9)(0.5)(0.8)— — — 
Loss on curtailment in current period— (0.8)(0.1)— — — 
Settlement loss(1.0)— — — — — 
Total amount recognized in accumulated other comprehensive income$(0.3)$(4.1)$3.9 $0.7 $1.7 $0.4 
Weighted Average Discount Rates [Table Text Block]
Following are the weighted-average discount rates (weighted by the plan level benefit obligation for pension benefits) used by the Company to calculate the Pension Plan, SERP and Medical Plan obligations at December 31, 2020 and 2019:
Pension Plan and SERP benefitsMedical Plan benefits
2020201920202019
Discount rate2.45 %3.13 %2.70 %3.40 %
Schedule of Assumptions Used [Table Text Block]
Following are the weighted-average assumptions (weighted by the net period benefit cost for pension benefits) used by the Company in determining the net periodic Pension Plan, SERP and Medical Plan cost for the years ended December 31:
Pension Plan and SERP benefitsMedical Plan benefits
202020192018202020192018
Discount rate3.21 %4.19 %3.50 %3.40 %4.30 %3.60 %
Expected long-term return on plan assets5.70 %5.70 %6.00 %n/an/an/a
Rate of increase in compensation(1)
n/a3.00 %3.50 %n/an/an/a
_______________________
(1)     As the Pension Plan was frozen, such that employees do not accrue additional defined benefits for future service or compensation on or after January 1, 2016, rate of increase in compensation for participants is no longer considered an assumption used by the Company to calculate the value of the Pension Plan. As of January 1, 2020, there were no longer any active employees eligible for the SERP. As such, the rate of increase in compensation is only used for the SERP for the years ended December 31, 2019 and 2018.
Schedule of Allocation of Plan Assets [Table Text Block]
The following table summarizes investments for which fair value is measured using the NAV per share practical expedient as of December 31, 2020 and 2019, respectively:
December 31, 2020December 31, 2019
TotalPercentage of totalTotalPercentage of total
(in millions, except percentages)
Cash and short-term investments$0.6 — %$0.6 1 %
Equity securities:
Domestic23.8 19 %30.6 27 %
International8.5 7 %10.5 9 %
Fixed income95.1 74 %72.2 63 %
Total investments$128.0 100 %$113.9 100 %
Schedule of Expected Benefit Payments [Table Text Block]
Expected Benefit Payments
As of December 31, 2020, the following future benefit payments are expected to be paid:
Pension Plan and SERP benefitsMedical Plan benefits
(in millions)
2021$9.0 $0.2 
2022$9.1 $0.2 
2023$7.6 $0.1 
2024$7.5 $0.1 
2025$6.8 $0.1 
2026 through 2030$31.4 $0.5 
Compensation and Employee Benefit Plans [Text Block] Participants receive 100% employer matching contributions on participant 401(k) plan contributions up to a percentage of qualifying earnings as described below.
Year Ended December 31,
202020192018
Employees who do not accrue a benefit in the SERP
Maximum employer matching of qualifying earnings8 %8 %8 %
Employees who accrue a benefit in the SERP
Maximum employer matching of qualifying earnings6 %6 %6 %
Changes In WRAP Plan Obligations and Securities [Table Text Block] "Deferred compensation mark-to-market adjustments" and "Unrealized gain/loss on marketable securities" for the years ended December 31, 2020, 2019 and 2018, respectively, are summarized in the table below:
Year Ended December 31,
(in millions)
202020192018
Deferred compensation mark-to-market adjustments$1.0 $2.3 $(3.9)
Unrealized (gain)/loss on marketable securities(3.2)(3.9)1.2