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Pension Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit (gains) costs recognized during interim periods was as follows:
 
Pension Benefits
 
Postretirement Benefits
 
Ended Three Months Ended 
 June 30,
 
Ended Six Months Ended 
 June 30,
 
Ended Three Months Ended 
 June 30,
 
Ended Six Months Ended 
 June 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service costs
$
0.6

 
$
0.5

 
$
1.3

 
$
1.1

 
$
—

 
$
—

 
$
—

 
$
—

Interest costs
0.5

 
0.6

 
1.0

 
1.1

 
0.2

 
0.2

 
0.3

 
0.4

Expected return on plan assets
(2.2
)
 
(2.0
)
 
(4.4
)
 
(4.1
)
 
—

 
—

 
—

 
—

Recognized net actuarial loss
0.2

 
0.2

 
0.3

 
0.5

 
0.2

 
0.2

 
0.4

 
0.4

Net periodic benefit (gains) costs
$
(0.9
)
 
$
(0.7
)
 
$
(1.8
)
 
$
(1.4
)
 
$
0.4

 
$
0.4

 
$
0.7

 
$
0.8