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Income Taxes - Tax Effects Of Temporary Differences (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss and tax credit carryforwards	$ 612.9	$ 584.9
163 (j) interest expense carryforward	49.3	0.0
Tax-deductible goodwill and amortizable intangibles	(48.6)	(29.4)
Capitalization of research and development expenses	42.7	0.0
Reserves and accruals	27.5	57.4
Property, plant and equipment	(81.2)	(63.5)
Inventories	22.0	20.2
Undistributed earnings of foreign subsidiaries	(63.7)	(48.7)
Share-based compensation	10.3	7.7
Pension	26.3	24.3
Other	8.0	6.0
Deferred tax assets and liabilities before valuation allowance	605.5	558.9
Valuation allowance	(357.9)	(347.5)
Net deferred tax asset	$ 247.6	$ 211.4

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