Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reserve for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	$ 85.7	$ 65.7	$ 41.9
Charged to Costs and Expenses	71.4	22.1	22.1
Charged to Other Comprehensive Income	0.0	0.0	0.0
Write-offs	(74.2)	(2.1)	1.7
Balance, End of Year	82.9	85.7	65.7
Deferred tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance, Beginning of Year	272.0	286.4	262.0
Charged to Costs and Expenses	(8.8)	(17.0)	27.8
Charged to Other Comprehensive Income	(1.8)	2.6	(3.4)
Write-offs	0.0	0.0	0.0
Balance, End of Year	$ 261.4	$ 272.0	$ 286.4

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of valuation and qualifying accounts and reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

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Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense.

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Amount of decrease in valuation and qualifying accounts and reserves.

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