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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended March 31, 2019 and 2018, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
March 31,
 
For the
Three Months Ended
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.8

 
$
0.9

 
$
—

 
$
—

Interest cost
1.1

 
1.1

 
0.3

 
0.4

Expected return on plan assets
(1.6
)
 
(2.0
)
 
(0.8
)
 
(1.1
)
Amortization of unrecognized net loss
0.6

 
0.4

 
—

 
—

Settlement charge
0.4

 
0.6

 
—

 
—

Net periodic benefit cost
$
1.3

 
$
1.0

 
$
(0.5
)
 
$
(0.7
)

The components of net periodic benefit cost, other than the service cost component, are included in Miscellaneous other income, net and the service cost component is included in Administrative and general on the Condensed Consolidated Statements of Income.