Segment Reporting (Income From Operations and Total Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income from Operations
Income from operations	$ 97.3	$ 199.6	$ 197.7	$ 292.0
Amortization of intangibles	(14.9)	(15.4)	(29.9)	(30.7)
Goodwill impairment charge	(20.0)	0.0	(20.0)	0.0
Income (loss) from operations	97.3	199.6	197.7	292.0
Total Assets
Total assets	7,778.0		7,778.0		$ 7,759.7
Cash and cash equivalents	404.4		404.4		432.8
Investments in affiliates	387.6		387.6		380.2
Intangible assets, net	470.0		470.0		501.7
Goodwill	1,246.6		1,246.6		1,298.3
Consolidated total assets	7,778.0		7,778.0		7,759.7
Operating Segments
Income from Operations
Income from operations	175.2	260.1	328.3	413.3
Income (loss) from operations	175.2	260.1	328.3	413.3
Total Assets
Total assets	4,624.6		4,624.6		4,501.5
Consolidated total assets	4,624.6		4,624.6		4,501.5
Segment Reconciling Items
Income from Operations
Corporate expenses	(29.1)	(32.9)	(63.5)	(64.7)
Amortization of intangibles	(14.9)	(15.4)	(29.9)	(30.7)
Stock compensation expense	(10.1)	(12.2)	(12.6)	(24.2)
Restructuring expenses	(3.8)	$ 0.0	(4.6)	$ (1.7)
Total Assets
Cash and cash equivalents	404.4		404.4		432.8
Investments in affiliates	387.6		387.6		380.2
Deferred tax assets, other current and noncurrent assets	644.8		644.8		645.2
Intangible assets, net	470.0		470.0		501.7
Goodwill	$ 1,246.6		$ 1,246.6		$ 1,298.3