Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	$ 444.0	$ 478.4	$ 530.1
Additions	35.9	41.4	20.6
Retirements	(74.2)	(95.6)	(66.3)
Other Changes	(22.1)	19.8	(6.0)
Balance as of End of Period	383.6	444.0	478.4
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	41.8	32.8	34.4
Additions	11.4	16.4	12.0
Retirements	(17.5)	(3.7)	(12.7)
Other Changes	(2.5)	(3.7)	(0.9)
Balance as of End of Period	33.2	41.8	32.8
Allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	402.2	445.6	495.7
Additions	24.5	25.0	8.6
Retirements	(56.7)	(91.9)	(53.6)
Other Changes	(19.6)	23.5	(5.1)
Balance as of End of Period	$ 350.4	$ 402.2	$ 445.6