Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserve for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	$ 82.9	$ 85.7	$ 65.7
Charged to Costs and Expenses	21.2	71.4	22.1
Charged to Other Comprehensive Income	0.0	0.0	0.0
Net recoveries, write-offs and other	(16.7)	(74.2)	(2.1)
Balance, End of Year	87.4	82.9	85.7
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	261.4	272.0	286.4
Charged to Costs and Expenses	42.2	(8.8)	(17.0)
Charged to Other Comprehensive Income	(0.3)	(1.8)	2.6
Net recoveries, write-offs and other	0.0	0.0	0.0
Balance, End of Year	$ 303.3	$ 261.4	$ 272.0