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Retirement and Postretirement Benefits
3 Months Ended
Mar. 31, 2018
Defined Benefit Plan [Abstract]  
Retirement and Postretirement Plans
Retirement and Postretirement Plans
The components of net periodic benefit cost for the three months ended March 31, 2018 and 2017 were as follows:
 
Three Months Ended
March 31, 2018
 
Three Months Ended
March 31, 2017
 
Components of net periodic benefit cost:
Pension
 
Postretirement
 
Pension
 
Postretirement
Service cost

$4.3

 

$0.4

 

$4.6

 

$0.4

Interest cost
11.4

 
1.9

 
12.2

 
2.1

Expected return on plan assets
(18.4
)
 
(1.2
)
 
(17.5
)
 
(1.4
)
Amortization of prior service cost
0.1

 
0.1

 
0.1

 
0.3

Net Periodic Benefit Cost

($2.6
)
 

$1.2

 

($0.6
)
 

$1.4