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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Costs of Retirement Plans
The following table presents the components of our Company-sponsored pension plan costs for the three and nine months ended September 30:
 
 
Three Months
 
Nine Months
(in millions)
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
0.1

 
$
—

 
$
0.3

Interest cost
11.4

 
11.1

 
34.2

 
32.9

Expected return on plan assets
(14.3
)
 
(15.0
)
 
(42.9
)
 
(45.2
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(0.3
)
 
(0.3
)
Amortization of prior net pension loss
3.2

 
3.5

 
9.6

 
10.9

Settlement adjustment
1.7

 
7.2

 
1.7

 
7.2

Total net periodic pension cost
$
1.9

 
$
6.8

 
$
2.3

 
$
5.8