Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018	Jan. 01, 2020
Trade Accounts Receivable [Member]
Change in the Valuation and Qualifying Accounts [Abstract]
Accounts Receivable, after Allowance for Credit Loss, Current				$ (2,287.1)			$ (2,283.3)
Accounting Standards Update 2016-13 [Member] | Trade Accounts Receivable [Member]
Change in the Valuation and Qualifying Accounts [Abstract]
Accounts Receivable, after Allowance for Credit Loss, Current							$ 3.8
Allowance for doubtful accounts
Change in the Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period		$ 95.4	[1]	119.6		$ 117.4
Charged to Costs and Expenses		66.8	[1]	22.0		54.7
Charged to Other Accounts	[2]	11.9	[1]	(2.9)		0.3
Deductions and Adjustments	[3]	(65.2)	[1]	(43.3)		(52.8)
Balance at End of Period		108.9	[1]	95.4	[1]	119.6
Valuation allowance for deferred tax assets
Change in the Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period		916.9		683.4		430.0
Charged to Costs and Expenses		94.7		187.0		213.8
Charged to Other Accounts	[2]	(7.3)		(2.1)		(21.3)
Deductions and Adjustments	[3]	(69.0)		48.6		60.9
Balance at End of Period		$ 935.3		$ 916.9		$ 683.4

[1] On January 1, 2020, we adopted ASU 2016-13, resulting in a $3.8 million increase to our trade receivables allowance for doubtful accounts. See Note 4 for further details.

[2] Additions charged to other accounts” includes translation adjustments.

[3] “Deductions and adjustments” includes write-offs, net of recoveries, increases in allowances offset by increases to deferred tax assets, and reductions in the allowances credited to expense.(c)On January 1, 2020, we adopted ASU 2016-13, resulting in a $3.8 million increase to our trade receivables allowance for doubtful accounts. See Note 4 for further details.