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Pension and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic (Benefit) Cost The components of net periodic (benefit) cost for the three months ended March 31, are summarized below: 
 
Pension Plan and SERP

Postretirement Plan
 
 
 
 
 
 
 
 
 
 
 
 
 
For the Three Months Ended March 31,

2020
 
2019
 
2020
 
2019
Interest cost
$
3.3

 
$
3.7

 
$
—

 
$
—

Expected return on plan assets
 
(7.6
)
 
 
(6.4
)
 
 
—

 
 
—

Amortization of net actuarial loss
 
1.0

 
 
1.2

 
 
—

 
 
0.1

Net periodic (benefit) cost 
$
(3.3
)
 
$
(1.5
)
 
$
—

 
$
0.1

Employer contributions, net
$
0.2

 
$
0.2

 
$
(0.4
)
 
$
(0.3
)