Income Tax Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Deferred tax liabilities, net	$ 21.5
Non-current deferred tax assets:
Compensation-related obligations	60.9	$ 54.8
Pension and postretirement benefits	102.4	115.9
Derivative instruments	76.5	41.8
Tax credit carryforwards	56.2	41.1
Tax loss carryforwards	331.6	267.1
Accrued liabilities and other	75.5	50.1
Valuation allowance	(62.2)	(73.8)
Total non-current deferred tax assets	640.9	497.0
Non-current deferred tax liabilities:
Fixed assets	358.3	353.7
Partnerships and investments	19.6	18.8
Foreign exchange gain/loss	0.0	0.0
Intangible assets	2,396.9	2,279.9
Total non-current deferred tax liabilities	2,774.8	2,652.4
Deferred Tax Assets, Net, Noncurrent	0.0	0.0
Net non-current deferred tax liabilities	$ 2,133.9	$ 2,155.4