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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30, 2017 and 2016, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Three Months Ended
June 30,
 
For the
Three Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
0.9

 
$
0.9

 
$
—

 
$
0.1

Interest cost
1.1

 
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
0.5

 
0.6

 
—

 
—

Settlement charge
0.6

 
1.2

 
—

 
—

Net periodic benefit cost
$
1.1

 
$
1.9

 
$
(0.7
)
 
$
(0.8
)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the six months ended June 30, 2017 and 2016, were as follows (in millions):
 
Retirement Plans
 
PBOP
 
For the
Six Months Ended
June 30,
 
For the
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
$
1.8

 
$
1.8

 
$
0.1

 
$
0.2

Interest cost
2.3

 
2.4

 
0.8

 
1.0

Expected return on plan assets
(3.9
)
 
(4.0
)
 
(2.2
)
 
(2.4
)
Amortization of prior service credit
—

 
—

 
—

 
(0.5
)
Amortization of unrecognized net loss
0.9

 
1.2

 
—

 
—

Settlement charge
1.1

 
2.0

 
—

 
—

Net periodic benefit cost
$
2.2

 
$
3.4

 
$
(1.3
)
 
$
(1.7
)