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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities at Fair Value
The following tables present, by level within the fair value hierarchy, the fair value of certain of our financial assets and liabilities:

 
Balance at
 
Basis of Fair Value Measurements
($ in millions)
December 31,
2012
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Short-term investments
$
12.4

 
$
12.4

 
$
—

 
$
—

Deferred compensation assets
4.0

 
4.0

 
—

 
—

 
$
16.4

 
$
16.4

 
$
—

 
$
—

Liabilities:
 

 
 

 
 

 
 

Contingent consideration
$
3.3

 
$
—

 
$
—

 
$
3.3

Deferred compensation liabilities
7.6

 
7.6

 
—

 
—

Interest rate swap contracts
8.6

 
—

 
8.6

 
—

Foreign currency contracts
1.4

 
—

 
1.4

 
—

Long-term debt
386.0

 
—

 
386.0

 
—

 
$
406.9

 
$
7.6

 
$
396.0

 
$
3.3


 
Balance at
 
Basis of Fair Value Measurements
($ in millions)
December 31,
2011
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Short-term investments
$
26.5

 
$
26.5

 
$
—

 
$
—

Deferred compensation assets
3.3

 
3.3

 
—

 
—

 
$
29.8

 
$
29.8

 
$
—

 
$
—

Liabilities:
 

 
 

 
 

 
 

Contingent consideration
$
2.1

 
$
—

 
$
—

 
$
2.1

Deferred compensation liabilities
4.6

 
4.6

 
—

 
—

Interest rate swap contracts
8.8

 
—

 
8.8

 
—

Long-term debt
279.2

 
—

 
279.2

 
—

 
$
294.7

 
$
4.6

 
$
288.0

 
$
2.1
Summary of Changes in Level 3 Fair Value Measurements
The following table provides a summary of changes in our Level 3 fair value measurements:

 
($ in millions)
Balance, December 31, 2010
$
2.3

Reduction in fair value recorded in earnings, net
(0.3
)
Foreign currency translation
0.1

Balance, December 31, 2011
2.1

Increase in fair value recorded in earnings
1.2

Balance, December 31, 2012
$
3.3