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
	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