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Other Financial Information - Rollforward of Sales Return and Allowance for Doubtful Accounts, Inventory Obsolescence and Income Tax Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss And Sales Returns And Allowances |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 52.0 | $ 36.0 | $ 28.3
Provision/Additions charged to expense | 47.5 | 59.6 | 55.3
Deductions, Write-offs and other, Reductions charged to other accounts | (44.0) | (43.6) | (47.6)
Ending balance | 55.5 | 52.0 | 36.0
SEC Schedule, 12-09, Reserve, Inventory |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 59.7 | 30.6 | 15.3
Provision/Additions charged to expense | 23.4 | 21.3 | 20.9
Deductions, Write-offs and other, Reductions charged to other accounts | (19.0) | 7.8 | (5.6)
Ending balance | 64.1 | 59.7 | 30.6
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 205.7 | 208.0 | 108.5
Provision/Additions charged to expense | 82.1 | 17.0 | 105.1
Deductions, Write-offs and other, Reductions charged to other accounts | (13.1) | (19.3) | (5.6)
Ending balance | $ 274.7 | $ 205.7 | $ 208.0

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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