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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2018
 
2017
Service cost
$
0.1

 
$
1.3

 
$
0.3

 
$
3.9

Interest cost
11.1

 
12.8

 
32.9

 
38.4

Expected return on plan assets
(15.0
)
 
(14.8
)
 
(45.2
)
 
(44.4
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.3
)
 
—

Amortization of prior net pension loss
3.5

 
3.9

 
10.9

 
11.7

Settlement loss
7.2

 
—

 
7.2

 
—

Total net periodic pension cost
$
6.8

 
$
3.2

 
$
5.8

 
$
9.6