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

Six months ended June 30,
 
2019
 
2018

2019
 
2018
Service cost
$
0.5

 
$
1.0

 
$
1.5

 
$
2.1

Interest cost
3.4

 
3.0

 
6.7

 
6.1

Expected return on plan assets
(4.3
)
 
(5.3
)
 
(9.1
)
 
(10.6
)
Amortization of prior service costs
0.5

 
0.1

 
0.5

 
0.1

Amortization of net loss
2.2

 
1.1

 
3.3

 
2.6

Net periodic benefit cost
$
2.3

 
$
(0.1
)
 
$
2.9

 
$
0.3


 
Other Postretirement Benefits ("OPEB")
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.7

 
$
0.0

 
$
0.7

 
$
0.1

Interest cost
1.2

 
(1.8
)
 
2.3

 
(0.7
)
Amortization of prior service cost
(1.8
)
 
(1.5
)
 
(3.1
)
 
(3.3
)
Amortization of net loss
0.4

 
3.3

 
1.1

 
4.4

Net periodic benefit cost
$
0.5

 
$
0.0

 
$
1.0

 
$
0.5