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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31:
 
 
Three Months
(in millions)
2019
 
2018
Service cost
$
—

 
$
0.1

Interest cost
11.4

 
10.9

Expected return on plan assets
(14.3
)
 
(15.1
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
Amortization of prior net pension loss
3.2

 
3.7

Total net periodic pension cost
$
0.2

 
$
(0.5
)