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Note 10. Employee Retirement Plans Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Allocation of Plan Assets [Table Text Block]
The target and actual allocations of the plans' assets at December 31, 2019 are as follows:
 
Target
Allocation
 
December 31,
2019
Cash and cash equivalents 
—
%
 
3
%
Liability hedging portfolio
100
%
 
92
%
Growth portfolio
—
%
 
5
%
Total
100
%
 
100
%
The estimated fair value of the plans' assets at December 31, 2019 and 2018, indicating input levels used to determine fair value are as follows:
 
Fair Value Measurement as of December 31, 2019
 
(in millions)
 
Level 1
 
Level 2
 
Level 3
 
Total
Temporary cash investments
$
13.5

 
$
—

 
$
—

 
$
13.5

Fixed Income — Government and agencies
—

 
121.7

 
—

 
121.7

Fixed Income — Corporate
—

 
370.5

 
—

 
370.5

Fixed Income — Asset-backed securities
—

 
2.2

 
—

 
2.2

Fixed Income — Collateralized mortgage-backed
—

 
4.1

 
—

 
4.1

Equity common trust funds
—

 
29.1

 
—

 
29.1

Debt common trust funds
—

 
—

 
7.4

 
7.4

 
$
13.5

 
$
527.6

 
$
7.4

 
$
548.5

 
Fair Value Measurement as of December 31, 2018
 
(in millions)
 
Level 1
 
Level 2
 
Level 3
 
Total
Temporary cash investments
$
14.0

 
$
—

 
$
—

 
$
14.0

Fixed Income — Government and agencies
—

 
77.1

 
—

 
77.1

Fixed Income — Corporate
—

 
309.1

 
—

 
309.1

Fixed Income — Collateralized mortgage-backed
—

 
2.1

 
—

 
2.1

Equity common trust funds
—

 
69.7

 
—

 
69.7

Debt common trust funds
—

 
—

 
6.7

 
6.7

 
$
14.0

 
$
458.0

 
$
6.7

 
$
478.7
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in other comprehensive (loss) income
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(in millions)
Actuarial (loss) gain
$
(37.7
)
 
$
(12.5
)
 
$
5.2

Amortization of actuarial loss
4.6

 
4.8

 
4.9

New prior service cost base
(1.5
)
 
—

 
—

Total before income taxes
(34.6
)
 
(7.7
)
 
10.1

Income tax (benefit) expense
(7.9
)
 
(1.8
)
 
3.1

Net amount recognized in other comprehensive (loss) income
$
(26.7
)
 
$
(5.9
)
 
$
7.0
Defined Benefit Plan, Assumptions [Table Text Block]
Actuarial assumptions
 
Year Ended December 31,
 
2019
 
2018
 
2017
Assumptions used to determine benefit obligations at the annual measurement date were:
 
 
 
 
 
Obligation discount rate
2.73%
 
4.45%
 
3.79%
Compensation increase rate(1)
n/a
 
n/a
 
4.00%
Assumptions used to determine net periodic benefit costs were:
 
 
 
 
 
Obligation discount rate
4.45%
 
3.79%
 
4.34%
Long-term rate of return on plan assets
4.90%
 
5.65%
 
6.25%
Compensation increase rate(1)
n/a
 
n/a
 
4.00%
(1) The compensation increase rate pertains to a plan associated with our Former Inland Barge Group. The Inland Barge Group was transferred to Arcosa in connection with the spin-off, but Trinity retained the pension plan. Effective as of November 1, 2018, all participants in this plan have been granted the maximum benefit allowed under the plan; therefore, the compensation increase rate is not applicable.
Schedule of Costs of Retirement Plans [Table Text Block]
Components of Net Periodic Benefit Cost and Other Retirement Expenses
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(in millions)
Expense Components
 
 
 
 
 
Service cost
$
0.1

 
$
0.1

 
$
0.2

Interest
19.7

 
18.3

 
19.6

Expected return on plan assets
(23.0
)
 
(27.4
)
 
(27.2
)
Amortization of actuarial loss
4.6

 
4.8

 
4.9

Other
—

 
0.6

 
—

Net periodic benefit cost
1.4

 
(3.6
)
 
(2.5
)
Profit sharing
11.0

 
11.1

 
7.7

Net expense
$
12.4

 
$
7.5

 
$
5.2
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]
Obligations and funded status
 
Year Ended December 31,
 
2019
 
2018
 
(in millions)
Accumulated Benefit Obligations
$
557.9

 
$
453.2

Projected Benefit Obligations:
 
 
 
Beginning of year
$
453.2

 
$
490.0

Service cost
0.1

 
0.1

Interest
19.7

 
18.3

Benefits paid
(22.2
)
 
(20.2
)
Actuarial (gain) loss
105.6

 
(35.6
)
Plan amendments
1.5

 
—

Other
—

 
0.6

End of year
$
557.9

 
$
453.2

Plans' Assets:
 
 
 
Beginning of year
$
478.7

 
$
488.0

Actual return on assets
90.9

 
(20.7
)
Employer contributions
1.1

 
31.6

Benefits paid
(22.2
)
 
(20.2
)
End of year
$
548.5

 
$
478.7

 
 
 
 
Consolidated Balance Sheet Components:
 
 
 
Other assets
$
5.5

 
$
39.4

Accrued liabilities
(14.9
)
 
(13.9
)
Net funded status
$
(9.4
)
 
$
25.5

Percent of projected benefit obligations funded
98.3
%
 
105.6
%
Schedule of Expected Benefit Payments [Table Text Block]
Benefit payments for our defined benefit plans are expected to be approximately $225 million in 2020 and approximately $336 million in 2021, which reflects the impact of the Pension Plan termination.