Segment Reporting (Income From Operations and Total Assets) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Reconciliation of Income From Operations from Segments to Consolidated
Income from operations	$ (241.7)	$ 496.4	$ 31.9	$ 883.7
Impairment charges	(5.1)	0.0	(5.1)	0.0
Loss on business held for sale	(494.6)	0.0	(494.6)	0.0
Amortization of intangibles	(31.7)	(14.1)	(45.6)	(28.9)
Restructuring expenses	(30.2)	(6.1)	(31.2)	(7.5)
Consolidated income (loss) from operations	(241.7)	496.4	31.9	883.7
Reconciliation of Assets from Segment to Consolidated
Assets	13,614.8		13,614.8		$ 11,421.2
Cash and cash equivalents	657.3		657.3		595.5
Investments in affiliates	518.3		518.3		512.7
Intangible assets, net	689.9		689.9		308.8
Goodwill	2,407.8		2,407.8		1,333.4
Operating Segments
Reconciliation of Income From Operations from Segments to Consolidated
Income from operations	390.2	574.4	739.7	1,033.5
Consolidated income (loss) from operations	390.2	574.4	739.7	1,033.5
Reconciliation of Assets from Segment to Consolidated
Assets	7,458.1		7,458.1		7,170.7
Segment Reconciling Items
Reconciliation of Income From Operations from Segments to Consolidated
Impairment charges	(5.1)	0.0	(5.1)	0.0
Loss on business held for sale	(494.6)	0.0	(494.6)	0.0
Corporate expenses	(62.9)	(45.0)	(115.9)	(87.1)
Amortization of intangibles	(31.7)	(14.1)	(45.6)	(28.9)
Stock compensation expense	(7.4)	(12.8)	(15.4)	(26.3)
Restructuring expenses	(30.2)	$ (6.1)	(31.2)	$ (7.5)
Reconciliation of Assets from Segment to Consolidated
Cash and cash equivalents	657.3		657.3		595.5
Investments in affiliates	518.3		518.3		512.7
Deferred tax assets, other current and noncurrent assets	1,506.9		1,506.9		1,500.1
Assets held for sale	376.5		376.5		0.0
Intangible assets, net	689.9		689.9		308.8
Goodwill	$ 2,407.8		$ 2,407.8		$ 1,333.4