Income Tax - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Compensation-related obligations	$ 43.2	$ 44.7
Pension and postretirement benefits	23.7	33.7
Tax credit carryforwards	36.0	39.0
Tax loss carryforwards	312.8	291.1
Accrued liabilities and other	202.5	149.0
Valuation allowance	(61.9)	(57.2)
Deferred tax assets	556.3	500.3
Deferred tax liabilities
Fixed assets	354.9	358.9
Partnerships and investments	38.7	33.2
Intangible assets	2,679.9	2,563.2
Derivative instruments	12.2	31.5
Deferred tax liabilities	3,085.7	2,986.8
Net deferred tax liabilities	$ 2,529.4	$ 2,486.5