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Retirement and Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2019
Defined Benefit Plan [Abstract]  
Schedule of Periodic Benefit Cost
The components of net periodic benefit cost (income) for the three months ended March 31, 2019 and 2018 were as follows:
 
Three Months Ended
March 31, 2019
 
Three Months Ended
March 31, 2018
 
Pension
 
Postretirement
 
Pension
 
Postretirement
Service cost

$4.3

 

$0.3

 

$4.3

 

$0.4

Interest cost
12.2

 
2.0

 
11.4

 
1.9

Expected return on plan assets
(16.2
)
 
(0.9
)
 
(18.4
)
 
(1.2
)
Amortization of prior service cost
0.1

 

 
0.1

 
0.1

Net Periodic Benefit Cost (Income)

$0.4

 

$1.4

 

($2.6
)
 

$1.2