Segment Reporting (Income From Operations and Total Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income from Operations
Income from operations	$ 224.0	$ 105.9	$ 421.7	$ 397.9
Amortization of intangibles	(14.8)	(14.9)	(44.7)	(45.6)
Goodwill impairment charge	0.0	0.0	(20.0)	0.0
Income from operations	224.0	105.9	421.7	397.9
Total Assets
Total assets	7,940.3		7,940.3		$ 7,759.7
Cash and cash equivalents	511.0		511.0		432.8
Investments in affiliates	411.3		411.3		380.2
Intangible assets, net	462.2		462.2		501.7
Goodwill	1,273.3		1,273.3		1,298.3
Consolidated total assets	7,940.3		7,940.3		7,759.7
Operating Segments
Income from Operations
Income from operations	286.3	160.4	614.6	573.7
Income from operations	286.3	160.4	614.6	573.7
Total Assets
Total assets	4,652.8		4,652.8		4,501.5
Consolidated total assets	4,652.8		4,652.8		4,501.5
Segment Reconciling Items
Income from Operations
Corporate expenses	(33.0)	(30.5)	(96.5)	(95.2)
Amortization of intangibles	(14.8)	(14.9)	(44.7)	(45.6)
Stock compensation expense	(13.7)	(7.8)	(26.3)	(32.0)
Restructuring expenses	(0.8)	$ (1.3)	(5.4)	$ (3.0)
Total Assets
Cash and cash equivalents	511.0		511.0		432.8
Investments in affiliates	411.3		411.3		380.2
Deferred tax assets, other current and noncurrent assets	629.7		629.7		645.2
Intangible assets, net	462.2		462.2		501.7
Goodwill	$ 1,273.3		$ 1,273.3		$ 1,298.3