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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Service cost (1)
$
2.6

 
$
4.0

 
$
5.3

 
$
8.0

Interest cost (2)
7.1

 
6.4

 
13.4

 
12.7

Expected return on plan assets (2)
(8.7
)
 
(9.5
)
 
(18.1
)
 
(18.9
)
Amortization of net loss (2)
5.9

 
5.8

 
13.7

 
11.5

Amortization of prior service credit (2)
(0.4
)
 
(1.3
)
 
(1.6
)
 
(2.5
)
Curtailment gain (2)
(11.4
)
 
—

 
(11.4
)
 
—

Net periodic pension cost
$
(4.9
)
 
$
5.4

 
$
1.3

 
$
10.8

 
 
 
 
 
 
 
 
(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 June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Service cost (1)
$
—

 
$
0.1

 
$
—

 
$
0.1

Interest cost (2)
0.2

 
0.3

 
0.3

 
0.5

Amortization of net loss (2)
0.2

 
0.1

 
0.4

 
0.3

Amortization of prior service credit (2)
(3.3
)
 
(3.3
)
 
(6.6
)
 
(6.6
)
Total other postretirement benefit cost
$
(2.9
)
 
$
(2.8
)
 
$
(5.9
)
 
$
(5.7
)
 
 
 
 
 
 
 
 
(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
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
The impacts of these changes to the plan as of May 11, 2018, are presented in the table below (in millions):
 
Liability increase (decrease)
 
Accumulated other comprehensive income (loss)
 
Deferred tax asset decrease (increase)
 
Income included in Other- net
 
Income tax expense (increase) decrease
Plan change to projected benefit obligation
$
(1.6
)
 
$
1.3

 
$
0.3

 
$
—

 
$
—

Remeasurement gain
(29.9
)
 
23.6

 
6.3

 
—

 
—

Curtailment
—

 
(9.0
)
 
(1.0
)
 
11.4

 
(1.4
)
Total
$
(31.5
)
 
$
15.9

 
$
5.6

 
$
11.4

 
$
(1.4
)