SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning	$ 45.3	$ 43.0	$ 37.1
Charged to Expense or Other Accounts	20.6	7.7	9.5
Write-offs and Other Adjustments	(8.2)	(5.4)	(3.6)
Balance at End of Period	57.7	45.3	43.0
Valuation Allowance for Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning	59.3	59.0	74.5
Charged to Expense or Other Accounts	0.0	4.7	(8.8)
Write-offs and Other Adjustments	(21.0)	(4.4)	(6.7)
Balance at End of Period	38.3	59.3	59.0
Reserve for Value-Added Tax Receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning	0.0	0.0	0.3
Charged to Expense or Other Accounts	0.0	0.0	0.0
Write-offs and Other Adjustments	0.0	0.0	(0.3)
Balance at End of Period	$ 0.0	$ 0.0	$ 0.0