Segment Reporting (Income From Operations and Total Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Reconciliation of Income From Operations from Segments to Consolidated
Income from operations	$ 423.6	$ 332.1	$ 1,307.3	$ 799.6
Impairment charges			0.0	36.0
Amortization of intangibles	(14.4)	(14.7)	(43.3)	(45.4)
Reconciliation of Assets from Segment to Consolidated
Assets	11,351.1		11,351.1		$ 10,103.7
Cash, cash equivalents and restricted cash	680.7		680.7		789.5
Investments in affiliates	512.2		512.2		436.9
Intangible assets, net	322.8		322.8		364.4
Goodwill	1,308.5		1,308.5		1,310.8
Operating Segments
Reconciliation of Income From Operations from Segments to Consolidated
Income from operations	508.1	395.3	1,541.6	1,020.6
Reconciliation of Assets from Segment to Consolidated
Assets	7,302.3		7,302.3		6,176.2
Segment Reconciling Items
Reconciliation of Income From Operations from Segments to Consolidated
Impairment charges	0.0	0.0	0.0	(36.0)
Corporate expenses	(59.5)	(40.1)	(146.6)	(110.8)
Amortization of intangibles	(14.4)	(14.7)	(43.3)	(45.4)
Stock compensation expense	(9.8)	(7.4)	(36.1)	(24.4)
Restructuring expenses	(0.8)	$ (1.0)	(8.3)	$ (4.4)
Reconciliation of Assets from Segment to Consolidated
Cash, cash equivalents and restricted cash	680.7		680.7		789.5
Investments in affiliates	512.2		512.2		436.9
Deferred tax assets, other current and noncurrent assets	1,224.6		1,224.6		1,025.9
Intangible assets, net	322.8		322.8		364.4
Goodwill	$ 1,308.5		$ 1,308.5		$ 1,310.8