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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of net periodic pension cost and amounts recognized in other comprehensive income (loss) for our pension plans:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
(in millions)
 
2015
 
2014
 
2015
 
2014
Components of net periodic pension cost:
 
 
 
 
 
 
 
 
Service cost
 
$
0.4

 
$
0.4

 
$
1.1

 
$
1.1

Interest cost
 
0.5

 
0.8

 
1.4

 
1.9

Expected return on plan assets
 
(0.5
)
 
(0.8
)
 
(1.6
)
 
(2.1
)
Amortization of net actuarial losses(a)
 
0.1

 
0.1

 
0.5

 
0.3

Amortization of transitional obligation
 
(0.1
)
 
—

 
(0.1
)
 
—

Net periodic pension cost
 
$
0.4

 
$
0.5

 
$
1.3

 
$
1.2


(a)
Reflects amounts reclassified from accumulated other comprehensive income (loss) to net income.