Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts
Change in the Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period		$ 117.4	$ 85.6	$ 48.2
Charged to Costs and Expenses		54.7	15.5	58.4
Charged to Other Accounts	[1]	0.3	19.8
Deductions and Adjustments	[2]	(52.8)	(3.5)	(21.0)
Balance at End of Period		119.6	117.4	85.6
Valuation allowance for deferred tax assets
Change in the Valuation and Qualifying Accounts [Abstract]
Balance at Beginning of Period		430.0	172.7	133.8
Charged to Costs and Expenses		213.8	258.7	38.9
Charged to Other Accounts	[1]	(21.3)	4.4
Deductions and Adjustments	[2]	60.9	(5.8)
Balance at End of Period		$ 683.4	$ 430.0	$ 172.7

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

[2] “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.