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Pension and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Changes in Projected Benefit Obligations
The change in benefit obligations and change in plan assets as of December 31 are as follows:

 
Pension
 
OPEB
 
2018
 
2017
 
2018
 
2017
Change in benefit obligation:
 
 
 
 
 
 
 
Benefit obligation at beginning of year
$
344.1

 
$
328.0

 
$
120.8

 
$
133.9

Service cost
4.3

 
4.4

 
0.2

 
0.8

Interest cost
12.4

 
13.3

 
4.2

 
5.3

Plan amendments
0.5

 
—

 
0.1

 
(27.4
)
Actuarial (gain) loss
(28.0
)
 
18.5

 
(10.5
)
 
14.7

Medicare Part D
—

 
—

 
0.3

 
0.4

Benefits paid
(18.9
)
 
(20.1
)
 
(6.4
)
 
(6.9
)
Benefit obligation at end of year
$
314.4

 
$
344.1

 
$
108.7

 
$
120.8
Schedule of Changes in Fair Value of Plan Assets
 
Pension
 
OPEB
 
2018
 
2017
 
2018
 
2017
Change in plan assets:
 
 
 
 
 
 
 
Fair value of plan assets at beginning of year
$
303.4

 
$
276.7

 
$
—

 
$
—

Actual return on plan assets
(24.6
)
 
45.0

 
—

 
—

Employer contributions
1.8

 
1.8

 
6.1

 
6.5

Medicare Part D subsidy received
—

 
—

 
0.3

 
0.4

Benefits paid
(18.9
)
 
(20.1
)
 
(6.4
)
 
(6.9
)
Fair value of assets at end of year
$
261.7

 
$
303.4

 
$
—

 
$
—
Schedule of Amounts Recognized in Balance Sheet
 
Pension
 
OPEB
 
2018
 
2017
 
2018
 
2017
Funded status of plans:
 
 
 
 
 
 
 
Funded status
$
(52.7
)
 
$
(40.7
)
 
$
(108.7
)
 
$
(120.8
)
Amounts recognized in the Consolidated Balance Sheets:
 
 
 
 
 
 
 
Non-current assets
—

 
—

 
—

 
—

Current liabilities
(1.8
)
 
(1.8
)
 
(7.5
)
 
(7.5
)
Non-current liabilities
(50.9
)
 
(38.9
)
 
(101.2
)
 
(113.3
)
Net amount recognized
$
(52.7
)
 
$
(40.7
)
 
$
(108.7
)
 
$
(120.8
)
Amounts recognized in accumulated other comprehensive loss (pre-tax):
 

 
 
 
 

 
 
Net loss
$
83.7

 
$
71.2

 
$
43.9

 
$
58.4

Prior service cost (benefit)
1.4

 
1.0

 
(21.6
)
 
(28.9
)
Total
$
85.1

 
$
72.2

 
$
22.3

 
$
29.5
Schedule of Net Benefit Cost
Net Periodic Benefit Cost:
 
Year Ended December 31,
 
Pension
 
OPEB
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Service cost
$
4.3

 
$
4.4

 
$
4.6

 
$
0.2

 
$
0.8

 
$
1.0

Interest cost
12.4

 
13.3

 
13.9

 
4.2

 
5.3

 
5.6

Expected return on plan assets
(21.1
)
 
(19.0
)
 
(18.8
)
 
—

 
—

 
—

Amortization of prior service costs
0.1

 
0.1

 
0.1

 
(7.3
)
 
(3.7
)
 
(2.7
)
Amortization of net loss
5.2

 
4.7

 
4.7

 
4.0

 
3.9

 
3.5

Curtailment (benefit) cost
—

 
—

 
—

 
—

 
(1.4
)
 
—

Net periodic benefit cost
$
0.9

 
$
3.5

 
$
4.5

 
$
1.2

 
$
4.9

 
$
7.4
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
Other changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (pre-tax):
 
Year Ended December 31,
 
Pension
 
OPEB
 
2018
 
2017
 
2018
 
2017
Net loss (gain)
$
17.6

 
$
(7.5
)
 
$
(10.5
)
 
$
14.7

Prior service cost (benefit)
0.5

 
—

 
0.1

 
(27.4
)
Amortization of net loss, including recognition due to settlement
(5.2
)
 
(4.7
)
 
(4.0
)
 
(3.9
)
Amortization of prior service (cost) benefit, including recognition due to curtailment
(0.1
)
 
(0.1
)
 
7.2

 
5.1

Total amount recognized in other comprehensive loss
12.8

 
(12.3
)
 
(7.2
)
 
(11.5
)
Net periodic benefit cost
0.9

 
3.5

 
1.2

 
4.9

Total recognized in net periodic benefit cost and other comprehensive loss
$
13.7

 
$
(8.8
)
 
$
(6.0
)
 
$
(6.6
)
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year
Amounts in accumulated other comprehensive loss expected to be recognized as components of net periodic benefit cost during 2019
 
Pension
 
OPEB
Amortization of net loss
$
5.9

 
$
3.7

Amortization of prior service cost (benefit)
0.1

 
(7.2
)
Schedule of Weighted Average Assumptions Used in Calculating Benefit Obligation and Net Periodic Benefit Cost
Weighted average assumptions used to determine net periodic benefit cost for the years ended December 31:
 
Pension
 
OPEB
 
2018
 
2017
 
2016
 
2018
 
2017
 
2016
Measurement date
12/31/2017
 
12/31/2016
 
12/31/2015
 
12/31/2017
 
12/31/2016
 
12/31/2015
Fiscal year end
12/31/2018
 
12/31/2017
 
12/31/2016
 
12/31/2018
 
12/31/2017
 
12/31/2016
Discount rate (1)
3.69%
 
4.15%
 
4.44%
 
3.66%
 
4.05%
 
4.50%
Rate of compensation increase (2)
3%/4%
 
3%/4%
 
3%/4%
 
3%/4%
 
3%/4%
 
3%/4%
Expected return on plan assets (3)
7.18%
 
6.82%
 
7.10%
 
—
 
—
 
—

(1) 
We use the Ryan Above Median Yield Curve to determine the discount rate.
(2) 
For 2018, the rate of compensation increase is 3% per year for the first year and 3.5% per year thereafter. For 2017, the rate of compensation increase is 3% for the first two years and 4% per year thereafter. For 2016, the rate of compensation increase is 3% per year for the first three years and 4% per year thereafter.
(3) 
The rate for each of our defined benefit plans was selected by taking into account our expected asset mix and is based on historical performance as well as expected future rates of return on plan assets.
 
Weighted average assumptions used to determine benefit obligations at December 31:
 
Pension
 
OPEB
 
2018
 
2017
 
2018
 
2017
Discount rate (1)
4.39%
 
3.69%
 
4.27%
 
3.66%
Rate of compensation increase (2)
3%/3.5%
 
3%/4%
 
3%/3.5%
 
3%/4%
Measurement date
12/31/2018
 
12/31/2017
 
12/31/2018
 
12/31/2017
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A one-percentage-point change in the assumed health care cost trend rate would have had the following effects in 2018:
 
1% Increase
 
1% Decrease
Effect on total of service and interest cost
$
0.4

 
$
(0.4
)
Effect on accumulated postretirement benefit obligation
10.6

 
(9.1
)
Schedule of Allocation of Plan Assets
Fair Value of Pension Plans’ assets included under the fair value hierarchy:
As of December 31, 2018
Level 1
 
Level 2
 
Level 3
 
Total
Equities:
 
 
 
 
 
 
 
U.S. equities
$
66.5

 
$
—

 
$
—

 
$
66.5

International equities
49.0

 
—

 
—

 
49.0

Fixed income
146.2

 
—

 
—

 
146.2

Total
$
261.7

 
$
—

 
$
—

 
$
261.7

As of December 31, 2017
 

 
 

 
 

 
 

Equities:
 

 
 

 
 

 
 

U.S. equities
$
86.5

 
$
—

 
$
—

 
$
86.5

International equities
79.1

 
—

 
—

 
79.1

Fixed income
137.7

 
—

 
—

 
137.7

Total
$
303.3

 
$
—

 
$
—

 
$
303.3

The Pension Plans’ weighted average long-term strategic asset allocation policy targets are as follows:
 
Pension Plan Asset Allocation
 
2018 Target
 
December 31, 2018
 
December 31, 2017
Equities:
 
 
 
 
 
U.S. equities
26%
 
25%
 
29%
International equities
22%
 
19%
 
26%
Fixed income
52%
 
56%
 
45%
 
 
 
100%
 
100%
Schedule Of Expected Benefit Plan Contributions
We expect to make the following contributions for 2019:
 
2019
Expected pension plan contributions
$
1.8

Expected OPEB benefits payments
7.5
Schedule of Expected Benefit Payments
The following table provides the estimated future benefit payments for the pension and other postretirement benefit plans:
 
Pension Benefits
 
OPEB Benefits
2019
$
20.6

 
$
7.5

2020
20.8

 
7.4

2021
20.9

 
7.6

2022
21.1

 
7.6

2023
21.1

 
7.6

2024 – 2028
100.6

 
37.0
Schedule of Multiemployer Plans
Century’s participation in the plan for the year ended December 31, 2018, is outlined in the table below.
Fund
 
Steelworkers Pension Trust
EIN / PN
 
23-6648508/499
Pension Protection Act Zone Status 2018 (1)
 
Green
Pension Protection Act Zone Status 2017 (1)
 
Green
Subject to Financial Improvement/Rehabilitation Plan
 
No
Contributions of Century Aluminum 2018
 
$1.0
Contributions of Century Aluminum 2017
 
$0.8
Contributions of Century Aluminum 2016
 
$0.8
Withdrawal from Plan Probable
 
No
Surcharge Imposed
 
No
Expiration Date of Collective Bargaining Agreement
 
April 1, 2020

(1)
The most recent Pension Protection Act zone status available in 2018 and 2017 is for the plan's year-end December 31, 2017 and December 31, 2016, respectively.  The zone status is based on information that Century received from the plan as well as publicly available information per the Department of Labor and is certified by the plan’s actuary. Among other factors, plans in the green zone are at least 80 percent funded.