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Pension and Post-Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31,
 
2018
 
2017
 
2018
 
2017
 
Pension Benefits
 
Other Benefits
Service cost
$
1.4

 
$
1.3

 
$
—

 
$
—

Interest cost
3.1

 
3.2

 
—

 
—

Expected return on plan assets
(4.7
)
 
(5.4
)
 
—

 
—

Amortization of prior service cost
—

 
0.1

 
(0.3
)
 
(0.6
)
Recognized actuarial loss
2.3

 
2.1

 
0.3

 
0.3

Settlements and curtailments
—

 
0.3

 
—

 
—

Net periodic benefit cost
$
2.1


$
1.6

 
$
—

 
$
(0.3
)