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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
September 30,
 
For the
Three Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
0.8

 
$
0.9

 
$
—

 
$
0.1

Interest cost
1.2

 
1.2

 
0.4

 
0.5

Expected return on plan assets
(2.0
)
 
(2.0
)
 
(1.1
)
 
(1.2
)
Amortization of prior service credit
—

 
—

 
—

 
(0.2
)
Amortization of unrecognized net loss
0.4

 
0.6

 
—

 
—

Settlement charge
0.4

 
0.7

 
—

 
—

Net periodic benefit cost
$
0.8

 
$
1.4

 
$
(0.7
)
 
$
(0.8
)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2017 and 2016, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Nine Months Ended
September 30,
 
For the
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
2.6

 
$
2.7

 
$
0.1

 
$
0.3

Interest cost
3.5

 
3.6

 
1.2

 
1.5

Expected return on plan assets
(5.9
)
 
(6.0
)
 
(3.3
)
 
(3.6
)
Amortization of prior service credit
—

 
—

 
—

 
(0.7
)
Amortization of unrecognized net loss
1.3

 
1.8

 
—

 
—

Settlement charge
1.5

 
2.7

 
—

 
—

Net periodic benefit cost
$
3.0

 
$
4.8

 
$
(2.0
)
 
$
(2.5
)