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Pension and Post-retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost recorded for the three months ended September 30, 2015 and 2014 were as follows (in millions):
 
Pension Benefits
 
Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.8

 
$
0.7

 
$
—

 
$
—

Interest cost
2.0

 
2.1

 
0.1

 
0.2

Expected return on plan assets
(2.8
)
 
(2.7
)
 
—

 
—

Amortization of prior service credit
(0.2
)
 
(0.2
)
 
—

 
—

Amortization of net loss
1.0

 
1.0

 
—

 
0.1

Net periodic benefit cost
$
0.8

 
$
0.9

 
$
0.1

 
$
0.3


The components of net periodic benefit cost recorded for the nine months ended September 30, 2015 and 2014 were as follows (in millions):
 
Pension Benefits
 
Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
2.3

 
$
1.9

 
$
0.1

 
$
0.1

Interest cost
6.0

 
6.2

 
0.3

 
0.4

Expected return on plan assets
(8.3
)
 
(8.0
)
 
—

 
—

Amortization of prior service credit
(0.6
)
 
(0.6
)
 
—

 
—

Amortization of net loss
4.5

 
3.0

 
0.1

 
0.2

Net periodic benefit cost
$
3.9

 
$
2.5

 
$
0.5

 
$
0.7