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Pension and Post-retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost recorded for the three months ended March 31, 2015 and 2014 were as follows (in millions):
 
Pension Benefits
 
Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.8

 
$
0.7

 
$
—

 
$
0.1

Interest cost
2.3

 
1.9

 
0.2

 
0.1

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

 
—

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

 
—

Amortization of net loss
1.0

 
1.9

 
0.1

 
0.1

Net periodic benefit cost
$
1.2

 
$
1.6

 
$
0.3

 
$
0.3