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Pension and Post-Retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost were as follows (in millions):
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
Pension Benefits
 
Pension Benefits
Service cost
$
1.2

 
$
1.3

 
$
2.4

 
$
2.7

Interest cost
1.9

 
3.1

 
5.4

 
6.2

Expected return on plan assets
(2.5
)
 
(4.7
)
 
(7.2
)
 
(9.4
)
Amortization of prior service cost
0.1

 
0.1

 
0.1

 
0.1

Recognized actuarial loss
0.9

 
2.3

 
2.9

 
4.6

Settlements and curtailments
60.6

 
—

 
60.6

 
—

Net periodic benefit cost
$
62.2


$
2.1

 
$
64.2

 
$
4.2