Income Taxes - Tax Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Before tax
Income (loss) before income taxes	$ (142.7)	$ (334.6)	$ (115.9)	$ (406.5)
Restructuring and other (income) charges, net	21.9	10.0	34.2	74.8
(Gain) loss on strategic investments	2.5	(0.1)	2.5	4.7
Goodwill impairment	183.8	349.1	183.8	349.1
Proxy contest charges	0.3	0.0	8.2	0.0
Other tax only discrete items	0.0	0.0	0.0	0.0
Total discrete items	208.5	359.0	228.7	428.6
Consolidated operations, before discrete items	65.8	24.4	112.8	22.1
Tax
Provision (benefit) for income taxes	3.8	(50.9)	10.1	(66.8)
Restructuring and other (income) charges, net	5.2	2.4	8.1	17.5
(Gain) loss on strategic investments, tax	0.6	0.0	0.6	1.1
Goodwill impairment	5.1	57.0	5.1	57.0
Proxy contest charges	0.1	0.0	1.9	0.0
Other tax only discrete items	(0.2)	(0.5)	(0.6)	(1.4)
Total discrete items	10.8	58.9	15.1	74.2
Consolidated operations, before discrete items	$ 14.6	$ 8.0	$ 25.2	$ 7.4
Effective tax rate (1)	(2.70%)	15.20%	(8.70%)	16.40%
EAETR	22.20%	33.50%	22.30%	34.50%
Inventory write-down		$ 0.0		$ 2.5