Restructuring, Business Transformation and Other Cost Saving Initiatives - Total Charges cost saving initiative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 76.0	$ 15.4	$ 120.0	$ 124.1
Severance Costs | 2022 Cost Saving Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	21.6	0.0	110.2
Severance Costs | 2022 Cost Saving Initiative | Restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	21.6	0.0	110.2
Accelerated Depreciation and Other Costs | 2022 Cost Saving Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	(6.2)	2.6	13.9
Accelerated Depreciation and Other Costs | 2022 Cost Saving Initiative | Restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	(6.2)	2.6	13.9
Gain (Loss) on Termination of Lease		5.3
Workforce Reduction | 2022 Cost Saving Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	15.4	2.6	124.1
Workforce Reduction | 2022 Cost Saving Initiative | Restructuring charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 15.4	$ 2.6	$ 124.1