Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Valuation allowances	$ (208.0)	$ (196.0)
Deferred tax assets, net	94.6	44.5
Domestic [Member]
Deferred tax assets, net	44.1	5.0
Foreign [Member]
Deferred tax assets, net	50.5	39.5
Deferred Tax Assets [Member]
Employee benefits	162.4	149.4
Inventory	32.9	27.3
Net operating loss (NOL) carryforwards	221.4	201.7
Tax credit carryforwards	88.6	47.8
Capital allowance carryforwards	10.2	9.3
Capitalized expenditures	45.9	42.9
Interest carryforward	10.4	43.9
Operating lease liabilities	25.7	27.1
Other	50.6	42.7
Valuation allowances	(208.0)	(196.0)
Deferred tax assets	440.1	396.1
Deferred Tax Liabilities [Member]
Other intangible assets	(179.9)	(199.7)
Fixed assets	(137.5)	(120.7)
Operating lease right-of-use assets	(25.6)	(27.1)
Other	(2.5)	(4.1)
Deferred tax liabilities	$ (345.5)	$ (351.6)