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Other Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Multiemployer Plans [Abstract]  
Schedule of Covered Employees and Contributions, Multiemployer Plans Total contributions to multiemployer plans and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, 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:
 
 
 
 
 
 
 
 
 
2019
2,117

 
5,349

 
$
21.8

 
$
1.5

 
$
23.3

2018
2,612

 
6,183

 
$
19.7

 
$
2.1

 
$
21.8

For the Six Months Ended June 30:
 
 
 
 
 
 
 
 
 
2019
1,626

 
5,349

 
$
28.8

 
$
2.8

 
$
31.5

2018
2,018

 
6,183

 
$
31.0

 
$
4.1

 
$
35.1