SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 442.8	$ 410.9	$ 315.1
Charged to Costs and Expenses	(56.5)	(158.4)	(1.1)
Charged to Other Accounts	(2.0)	(12.3)	8.1
Deductions	6.7	202.6	88.8
Balance at End of Period	391.0	442.8	410.9
Trade accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	10.9	9.1	7.8
Charged to Costs and Expenses	5.4	5.6	5.0
Charged to Other Accounts	0.0	0.0	0.0
Deductions	(5.1)	(3.8)	(3.7)
Balance at End of Period	11.2	10.9	9.1
Deferred income tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	431.9	401.8	307.3
Charged to Costs and Expenses	(61.9)	(164.0)	(6.1)
Charged to Other Accounts	(2.0)	(12.3)	8.1
Deductions	11.8	206.4	92.5
Balance at End of Period	$ 379.8	$ 431.9	$ 401.8