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Other Financial Information
 12 Months Ended
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, 2020December 31, 2019December 31, 2018
Research and development expense$228.6 $229.4 $198.3 
Depreciation expense60.3 57.1 60.4 
Rent expense78.6 81.4 80.4 
Advertising expense28.3 30.3 35.2 

Items reported in accrued expenses and other liabilities include the following:
December 31, 2020December 31, 2019
Deferred revenue$199.6 $160.9 
Accrued payroll and other employee compensation138.5 145.4 
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, 2020December 31, 2019December 31, 2018
Beginning balance$52.0 $36.0 $28.3 
Provision charged to expense47.5 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, 2020December 31, 2019December 31, 2018
Beginning balance$59.7 $30.6 $15.3 
Provision charged to expense23.4 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, 2020December 31, 2019December 31, 2018
Beginning balance$205.7 $208.0 $108.5 
Additions charged to expense82.1 17.0 105.1 
Reductions charged to other accounts(13.1)(19.3)(5.6)
Ending balance$274.7 $205.7 $208.0