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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30, 2018 and 2017, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
September 30,
 
For the
Three Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
0.7

 
$
0.8

 
$
—

 
$
—

Interest cost
1.2

 
1.2

 
0.4

 
0.4

Expected return on plan assets
(1.7
)
 
(2.0
)
 
(1.2
)
 
(1.1
)
Amortization of unrecognized net loss
0.3

 
0.4

 
—

 
—

Settlement charge
0.4

 
0.4

 
—

 
—

Net periodic benefit cost
$
0.9

 
$
0.8

 
$
(0.8
)
 
$
(0.7
)


Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2018 and 2017, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Nine Months Ended
September 30,
 
For the
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Service cost
$
2.5

 
$
2.6

 
$
0.1

 
$
0.1

Interest cost
3.4

 
3.5

 
1.1

 
1.2

Expected return on plan assets
(5.7
)
 
(5.9
)
 
(3.5
)
 
(3.3
)
Amortization of unrecognized net loss
1.1

 
1.3

 
—

 
—

Settlement charge
2.6

 
1.5

 
—

 
—

Net periodic benefit cost
$
3.9

 
$
3.0

 
$
(2.3
)
 
$
(2.0
)

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.