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Other Financial Information | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Other Financial Information | OTHER FINANCIAL INFORMATION Items reported in earnings include the following:
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Research and development expense | $ | 228.6 |  |  | $ | 229.4 |  |  | $ | 198.3 |
Depreciation expense | 60.3 |  |  | 57.1 |  |  | 60.4 |
Rent expense | 78.6 |  |  | 81.4 |  |  | 80.4 |
Advertising expense | 28.3 |  |  | 30.3 |  |  | 35.2 |
Items reported in accrued expenses and other liabilities include the following:
| December 31, 2020 |  | December 31, 2019
Deferred revenue | $ | 199.6 |  |  | $ | 160.9 |
Accrued payroll and other employee compensation | 138.5 |  |  | 145.4 |
Litigation reserve (see Note 19) | 96.6 |  |  | 92.9 |
Restructuring (see Note 3) | 69.3 |  |  | 22.2 |
Operating lease liabilities (see Note 6) | 42.3 |  |  | 35.0 |
Contract liabilities | 36.1 |  |  | 39.8 |
Product warranty (see Note 1) | 36.5 |  |  | 43.3 |
Other | 282.9 |  |  | 328.2 |
Total | $ | 901.8 |  |  | $ | 867.7 |
The change in the sales returns and allowances and allowance for doubtful accounts is as follows:
| Year Ended
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Beginning balance | $ | 52.0 |  |  | $ | 36.0 |  |  | $ | 28.3 |
Provision charged to expense | 47.5 |  |  | 59.6 |  |  | 55.3 |
Deductions | (44.0) |  |  | (43.6) |  |  | (47.6) |
Ending balance | $ | 55.5 |  |  | $ | 52.0 |  |  | $ | 36.0 |
The change in inventory obsolescence is as follows:
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Beginning balance | $ | 59.7 |  |  | $ | 30.6 |  |  | $ | 15.3 |
Provision charged to expense | 23.4 |  |  | 21.3 |  |  | 20.9 |
Write-offs and other | (19.0) |  |  | 7.8 |  |  | (5.6) |
Ending balance | $ | 64.1 |  |  | $ | 59.7 |  |  | $ | 30.6 |
The change in the income tax valuation allowance is as follows:
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Beginning balance | $ | 205.7 |  |  | $ | 208.0 |  |  | $ | 108.5 |
Additions charged to expense | 82.1 |  |  | 17.0 |  |  | 105.1 |
Reductions charged to other accounts | (13.1) |  |  | (19.3) |  |  | (5.6) |
Ending balance | $ | 274.7 |  |  | $ | 205.7 |  |  | $ | 208.0 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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