| Supplementary Balance Sheet Data |
| 3. |
|
Supplementary Balance Sheet Data |
| |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
September 30, |
|
|
December 31, |
|
|
September 30, |
|
| |
|
2011 |
|
|
2010 |
|
|
2010 |
|
|
Accounts receivable — allowance for doubtful accounts
|
|
$ |
63.7 |
|
|
$ |
78.0 |
|
|
$ |
74.1 |
|
|
Accounts receivable — allowance for sales returns
|
|
|
233.2 |
|
|
|
197.3 |
|
|
|
241.8 |
|
|
Prepublication costs — accumulated amortization
|
|
|
1,038.4 |
|
|
|
1,089.3 |
|
|
|
1,057.8 |
|
|
Property and equipment — accumulated depreciation
|
|
|
1,056.8 |
|
|
|
1,009.2 |
|
|
|
997.2 |
|
|