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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Summary of Net Periodic Pension and Other Postemployment Benefit Costs
The components of net periodic pension cost were as follows (in millions):
 
Three months ended March 31,
 
2019
 
2018
Service cost (1)
$
0.5

 
$
2.7

Interest cost (2)
7.3

 
6.3

Expected return on plan assets (2)
(9.1
)
 
(9.4
)
Amortization of net loss (2)
2.3

 
7.8

Amortization of prior service credit (2)
—

 
(1.2
)
Net periodic pension cost
$
1.0

 
$
6.2

 
 
 
 
(1) Included in Direct operating costs and Selling, general and administrative on the Condensed Consolidated Statements of Operations
(2) Included in Other - net on the Condensed Consolidated Statements of Operations
The components of net periodic cost of other postretirement benefits were as follows (in millions):
 
Three months ended March 31,
 
2019
 
2018
Service cost (1)
$
—

 
$
—

Interest cost (2)
0.1

 
0.1

Amortization of net loss (2)
0.1

 
0.2

Amortization of prior service credit (2)
(3.0
)
 
(3.3
)
Total other postretirement benefit cost
$
(2.8
)
 
$
(3.0
)
 
 
 
 
(1) Included in Direct operating costs and Selling, general and administrative on the Condensed Consolidated Statements of Operations
(2) Included in Other - net on the Condensed Consolidated Statements of Operations