Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Summary of Significant Accounting Policies [Abstract]

Contract with Customer, Asset and Liability [Table Text Block]

Contract balances

The following table provides 2021 and 2020 information about receivables and deferred revenue, which represent contract liabilities from contracts with customers:

	2021				2020
Contract balance information	Trade Receivables		Contract liabilities		Trade Receivables		Contract liabilities
Balance at January 1	$	646.9	$	346.8	$	619.3	$	320.5
Balance at December 31	$	595.2	$	322.4	$	646.9	$	346.8

Accounts Receivable, Allowance for Credit Loss

The following table summarizes the Company’s allowances for doubtful accounts:

	2021		2020		2019
Balance at January 1	$	37.5	$	42.2	$	58.2
Charged to costs and expenses	9.8		10.1		5.2
Charged to other accounts (1)	—		(1.2)		(0.9)
Deductions (2)	(12.0)		(13.6)		(20.3)
Balance at December 31	$	35.3	$	37.5	$	42.2

(1)    Includes net effects of foreign currency translation

(2)    Uncollectible accounts written-off, net of recoveries.