Segment Reporting (Income From Operations And Total Assets) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from operations	$ 348.1	$ 489.0	$ 404.4
Goodwill and Intangible Asset Impairment	(176.6)	0.0	0.0
Amortization of intangibles	(61.1)	(64.7)	(57.0)
Cash and cash equivalents	432.8	326.1
Receivables from affiliates	15.2	12.9
Investment in affiliates	380.2	400.0
Intangible assets, net	501.7	573.1
Goodwill	1,298.3	1,495.5	1,541.4	$ 1,376.4
Total assets	7,759.7	7,626.4	7,971.7
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income from operations	763.8	743.7	624.4
Total assets	4,501.5	4,175.1	4,390.0
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Corporate expenses	(129.0)	(133.7)	(116.2)
Stock compensation (expense) credit	(40.0)	(44.3)	(35.6)
Restructuring and other infrequent expenses	(9.0)	(12.0)	(11.2)
Amortization of intangibles	(61.1)	(64.7)	(57.0)
Cash and cash equivalents	432.8	326.1	367.7
Investment in affiliates	380.2	400.0	409.0
Deferred tax assets, other current and noncurrent assets	645.2	656.6	614.6
Intangible assets, net	501.7	573.1	649.0
Goodwill	$ 1,298.3	$ 1,495.5	$ 1,541.4

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