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Other Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Covered Employees and Contributions, Multiemployer Plans Total contributions to multiemployer plans and the related number of employees covered by these plans for the periods indicated were as follows:
 
Multiemployer Plans
 
Covered Employees
 
Contributions (in millions)
 
Low
 
High
 
Pension
 
Other Multiemployer
 
Total
For the Three Months Ended June 30:
 
 
 
 
 
 
 
 
 
2020
1,424

 
1,469

 
$
6.9

 
$
2.1

 
$
9.0

2019
2,117

 
5,349

 
$
21.8

 
$
1.5

 
$
23.3

For the Six Months Ended June 30:
 
 
 
 
 
 
 
 
 
2020
1,119

 
1,469

 
$
12.3

 
$
3.8

 
$
16.1

2019
1,626

 
5,349

 
$
28.8

 
$
2.8

 
$
31.5