Income Taxes - Components of Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses	$ 112.7	$ 224.5
Interest carryforward	69.3	17.3
Capital loss carryforward	66.6	0.0
Tax credits	33.8	38.5
Employee benefits	22.2	38.6
Research and development costs	18.4	11.8
Unrealized foreign exchange	9.9	17.3
Accrued liabilities	5.3	26.4
Accounts receivable	1.3	16.0
Financing activities	0.1	11.8
Arysta outside basis difference	0.0	274.2
Goodwill	0.0	10.3
Other	18.4	14.9
Total deferred tax assets	358.0	701.6
Valuation allowance	(219.6)	(475.2)
Total gross deferred tax assets	138.4	226.4
Deferred tax liabilities:
Intangible assets	198.0	631.2
Property, plant and equipment	17.9	31.8
Undistributed foreign earnings	9.9	29.5
Goodwill	6.3	0.0
Other	0.0	0.4
Total gross deferred tax liabilities	232.1	692.9
Net deferred tax liability	$ 93.7	$ 466.5