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Components of Net Periodic Benefit Cost (Tables)
 9 Months Ended
Sep. 30, 2019
Components of net periodic benefit cost [Abstract]  
Schedule of net periodic benefit cost
 
Pension Benefits
 
Three months ended September 30,

Nine months ended September 30,
 
2019
 
2018

2019
 
2018
Service cost
$
1.0

 
$
1.1

 
$
2.5

 
$
3.2

Interest cost
3.3

 
3.1

 
10.0

 
9.2

Expected return on plan assets
(4.5
)
 
(5.3
)
 
(13.7
)
 
(15.8
)
Amortization of prior service costs
0.0

 
0.0

 
0.6

 
0.1

Amortization of net loss
1.6

 
1.3

 
4.9

 
3.9

Net periodic benefit cost
$
1.4

 
$
0.2

 
$
4.3

 
$
0.6


 
Other Postretirement Benefits ("OPEB")
 
Three months ended September 30,
 
Nine months ended September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.0

 
$
0.1

 
$
0.8

 
$
0.2

Interest cost
1.1

 
1.0

 
3.4

 
0.4

Amortization of prior service cost
(1.2
)
 
(1.8
)
 
(4.3
)
 
(5.1
)
Amortization of net loss
0.6

 
1.0

 
1.7

 
5.4

Net periodic benefit cost
$
0.5

 
$
0.3

 
$
1.6

 
$
0.9