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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2019
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 9 – 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 Consolidated 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 Line
 
2019
 
2018
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, 2019 and 2018, as well as the funded status of the plans and amounts recognized in the financial statements at December 31, 2019 and 2018:
 
Pension Plan and SERP benefits
 
Medical Plan benefits
 
2019
 
2018
 
2019
 
2018
Change in benefit obligation
(in millions)
Benefit obligation at January 1,
$
122.1

 
$
130.0

 
$
2.5

 
$
2.9

Service cost
0.3

 
0.8

 
—

 
—

Interest cost
4.8

 
4.6

 
0.1

 
0.1

Curtailments
1.2

 
0.1

 
—

 
—

Benefit payments
(6.2
)
 
(5.8
)
 
(0.9
)
 
(0.4
)
Plan amendments
—

 
—

 
—

 
—

Actuarial loss (gain)
13.0

 
(7.6
)
 
0.9

 
(0.1
)
Benefit obligation at December 31,
$
135.2

 
$
122.1

 
$
2.6

 
$
2.5

Change in plan assets
 
 
 
 
 
 
 
Fair value of plan assets at January 1,
$
93.3

 
$
100.5

 
$
—

 
$
—

Actual return on plan assets
21.3

 
(7.1
)
 
—

 
—

Company contributions to the plan
5.5

 
5.7

 
0.9

 
0.4

Benefit payments
(6.2
)
 
(5.8
)
 
(0.9
)
 
(0.4
)
Fair value of plan assets at December 31,
113.9

 
93.3

 
—

 
—

Underfunded status (current and long-term)
$
(21.3
)
 
$
(28.8
)
 
$
(2.6
)
 
$
(2.5
)
Amounts recognized in balance sheets
 
 
 
 
 
 
 
Accounts payable and accrued expenses
$
(9.2
)
 
$
(1.1
)
 
$
(0.2
)
 
$
(0.2
)
Other long-term liabilities
(12.1
)
 
(27.7
)
 
(2.4
)
 
(2.3
)
Total amount recognized in balance sheet
$
(21.3
)
 
$
(28.8
)
 
$
(2.6
)
 
$
(2.5
)
Amounts recognized in AOCI
 
 
 
 
 
 
 
Net actuarial loss (gain)
$
15.7

 
$
19.4

 
$
0.4

 
$
(0.5
)
Prior service cost
—

 
0.4

 
—

 
(0.8
)
Total amount recognized in AOCI
$
15.7

 
$
19.8

 
$
0.4

 
$
(1.3
)
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 benefits
 
Medical Plan benefits
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Components of net periodic benefit cost
(in millions)
Service cost
$
0.3

 
$
0.8

 
$
0.8

 
$
—

 
$
—

 
$
—

Interest cost
4.8

 
4.6

 
4.7

 
0.1

 
0.1

 
0.1

Expected return on plan assets
(5.9
)
 
(5.8
)
 
(5.4
)
 
—

 
—

 
—

Curtailment (gain) loss
2.0

 
0.3

 
0.7

 
(0.8
)
 
(0.2
)
 
—

Settlements
—

 
—

 
0.2

 
—

 
—

 
—

Amortization of prior service costs
0.4

 
0.8

 
1.0

 
—

 
(0.3
)
 
(0.3
)
Amortization of actuarial loss
0.5

 
0.8

 
0.5

 
—

 
—

 
(0.1
)
Periodic expense
$
2.1

 
$
1.5

 
$
2.5


$
(0.7
)
 
$
(0.4
)
 
$
(0.3
)
Components recognized in accumulated other comprehensive income
 
 
 
 
 
 
 
 
 
 
 
Current period prior service cost
$
—

 
$
—

 
$
(0.7
)
 
$
—

 
$
0.2

 
$
(2.5
)
Current period actuarial (gain) loss
(2.4
)
 
5.6

 
(7.5
)
 
0.9

 
(0.1
)
 
(0.1
)
Amortization of prior service cost
(0.4
)
 
(0.8
)
 
(1.0
)
 
0.8

 
0.3

 
0.3

Amortization of actuarial gain (loss)
(0.5
)
 
(0.8
)
 
(0.5
)
 
—

 
—

 
0.1

Loss on curtailment in current period
(0.8
)
 
(0.1
)
 
(0.3
)
 
—

 
—

 
—

Settlements
—

 
—

 
(0.2
)
 
—

 
—

 
—

Total amount recognized in accumulated other comprehensive income
$
(4.1
)
 
$
3.9

 
$
(10.2
)
 
$
1.7

 
$
0.4

 
$
(2.2
)
Schedule of Assumptions Used [Table Text Block]
Following are the weighted-average assumptions (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, 2019 and 2018:
 
Pension Plan and SERP benefits
 
Medical Plan benefits
 
2019
 
2018
 
2019
 
2018
Discount rate
3.13
%
 
4.19
%
 
3.40
%
 
4.30
%
Rate of increase in compensation(1)
n/a

 
3.00
%
 
n/a

 
n/a

_______________________
(1)  
The Pension Plan was frozen effective January 1, 2016, and as a result, the 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 such, for the year ended December 31, 2018, the rate of increase in compensation is only used for the SERP. For the year ended December 31, 2019, there are no longer any eligible participants in the SERP. As such, the rate of increase in compensation is no longer considered an assumption used to calculate the value of the SERP.
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] (Deprecated 2012-01-31)
The following table summarizes investments for which fair value is measured using the NAV per share practical expedient as of December 31, 2019 and 2018, respectively:
 
December 31, 2019
 
December 31, 2018
 
Total
 
Percentage of total
 
Total
 
Percentage of total
 
(in millions, except percentages)
Cash and short-term investments
$
0.6

 
1
%
 
$
0.7

 
1
%
Equity securities:
 
 
 
 
 
 
 
Domestic
30.6

 
27
%
 
20.7

 
22
%
International
10.5

 
9
%
 
10.0

 
11
%
Fixed income
72.2

 
63
%
 
61.9

 
66
%
Total investments
$
113.9

 
100
%
 
$
93.3

 
100
%
Schedule of Expected Benefit Payments [Table Text Block]
Expected Benefit Payments
As of December 31, 2019, the following future benefit payments are expected to be paid:
 
Pension Plan and SERP benefits
 
Medical Plan benefits
 
(in millions)
2020
$
15.1

 
$
0.2

2021
$
8.9

 
$
0.2

2022
$
9.0

 
$
0.2

2023
$
7.6

 
$
0.2

2024
$
7.5

 
$
0.1

2025 through 2029
$
31.8

 
$
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,
 
2019
 
2018
 
2017
Employees who do not accrue a benefit in the SERP
 
 
 
 
 
Maximum employer matching of qualifying earnings
8
%
 
8
%
 
8
%
 
 
 
 
 
 
Employees who accrue a benefit in the SERP
 
 
 
 
 
Maximum employer matching of qualifying earnings
6
%
 
6
%
 
6
%
Pension plan, SERP and medical plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
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 benefits
 
Medical Plan benefits
 
2019
 
2018
 
2017
 
2019
 
2018
 
2017
Discount rate
4.19
%
 
3.50
%
 
4.00
%
 
4.30
%
 
3.60
%
 
4.10
%
Expected long-term return on plan assets
5.70
%
 
6.00
%
 
6.00
%
 
n/a

 
n/a

 
n/a

Rate of increase in compensation(1)
3.00
%
 
3.50
%
 
3.50
%
 
n/a

 
n/a

 
3.50
%
_______________________
(1)  
The Pension Plan was frozen effective January 1, 2016, and as a result, the rate of increase in compensation for participants is no longer considered an assumption used by the Company to calculate the net period benefit cost of the Pension Plan. As such, for the years ended December 31, 2019 and 2018, the rate of increase in compensation is only used for the SERP.