Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 114.7	$ 154.5	$ 159.9
Additions Charged to Costs and Expenses	26.6	21.5	16.0
Additions Charged to Other Accounts	0.0	0.0	0.0
Deductions	(22.5)	(61.3)	(21.4)
Ending balance	118.8	114.7	154.5
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	387.0	780.4	443.6
Additions Charged to Costs and Expenses	41.0	42.7	82.2
Additions Charged to Other Accounts	16.1	0.0	260.8
Deductions	(22.7)	(436.1)	(6.2)
Ending balance	$ 421.4	$ 387.0	$ 780.4