Income Tax - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Non-current deferred tax assets
Compensation-related obligations	$ 54.8	$ 60.9
Pension and postretirement benefits	24.5	102.4
Derivative instruments	0.0	76.5
Tax credit carryforwards	38.3	56.2
Tax loss carryforwards	359.0	331.6
Accrued liabilities and other	97.7	75.5
Valuation allowance	(60.7)	(62.2)
Total non-current deferred tax assets	513.6	640.9
Non-current deferred tax liabilities:
Fixed assets	422.4	358.3
Partnerships and investments	29.7	19.6
Intangible assets	2,539.7	2,396.9
Derivative instruments	19.5	0.0
Total non-current deferred tax liabilities	3,011.3	2,774.8
Net non-current deferred tax liabilities	$ 2,497.7	$ 2,133.9