Consolidated Balance Sheets (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010 | Sep. 30, 2010 |
|---|
| Current assets: | | | |
| Cash and equivalents | $ 1,437.6 | $ 1,525.6 | $ 1,322.8 |
| Short-term investments | 36.2 | 22.2 | 32.8 |
| Accounts receivable, net | 1,133.3 | 972.8 | 1,106.9 |
| Inventories | 285.3 | 275.1 | 295.1 |
| Deferred income taxes | 281.5 | 281.2 | 291.4 |
| Prepaid and other current assets | 215.6 | 297.7 | 209.7 |
| Total current assets | 3,389.5 | 3,374.6 | 3,258.7 |
| Prepublication costs, net | 304.9 | 365.0 | 352.4 |
| Property and equipment, net | 488.3 | 521.3 | 515.7 |
| Goodwill | 2,037.8 | 1,887.0 | 1,865.5 |
| Other intangible assets, net | 621.3 | 616.3 | 608.2 |
| Other non-current assets | 311.9 | 282.4 | 283.8 |
| Total assets | 7,153.7 | 7,046.6 | 6,884.3 |
| Current liabilities: | | | |
| Accounts payable | 333.5 | 391.8 | 332.6 |
| Accrued royalties | 101.1 | 114.5 | 103.0 |
| Accrued compensation and contributions to retirement plans | 429.4 | 498.3 | 415.4 |
| Income taxes currently payable | 249.9 | 22.7 | 160.3 |
| Unearned revenue | 1,244.6 | 1,204.2 | 1,124.4 |
| Other current liabilities | 401.7 | 449.8 | 452.0 |
| Total current liabilities | 2,760.2 | 2,681.3 | 2,587.7 |
| Long-term debt | 1,198.0 | 1,198.0 | 1,197.9 |
| Pension and other postretirement benefits | 470.0 | 436.5 | 493.6 |
| Other non-current liabilities | 437.4 | 439.4 | 390.6 |
| Total liabilities | 4,865.6 | 4,755.2 | 4,669.8 |
| Commitments and contingencies (Note 13) | | | |
| Equity : | | | |
| Common stock | 411.7 | 411.7 | 411.7 |
| Additional paid-in capital | 147.9 | 67.0 | 65.7 |
| Retained income | 7,525.1 | 7,056.6 | 6,975.5 |
| Accumulated other comprehensive loss | (372.9) | (367.4) | (330.9) |
| Less: common stock in treasury | (5,503.6) | (4,957.6) | (4,991.9) |
| Total equity - controlling interests | 2,208.2 | 2,210.3 | 2,130.1 |
| Total equity - noncontrolling interests | 79.9 | 81.1 | 84.4 |
| Total equity | 2,288.1 | 2,291.4 | 2,214.5 |
| Total liabilities and equity | $ 7,153.7 | $ 7,046.6 | $ 6,884.3 |