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 as of Beginning of Period	$ 383.6	$ 444.0	$ 478.4
Additions	45.6	35.9	41.4
Retirements	(41.6)	(74.2)	(95.6)
Other Changes	(6.8)	(22.1)	19.8
Balance as of End of Period	380.8	383.6	444.0
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	33.2	41.8	32.8
Additions	14.3	11.4	16.4
Retirements	(10.9)	(17.5)	(3.7)
Other Changes	(0.6)	(2.5)	(3.7)
Balance as of End of Period	36.0	33.2	41.8
Allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	350.4	402.2	445.6
Additions	31.3	24.5	25.0
Retirements	(30.7)	(56.7)	(91.9)
Other Changes	(6.2)	(19.6)	23.5
Balance as of End of Period	$ 344.8	$ 350.4	$ 402.2