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Supplemental Financial Statement Information (Tables)
 12 Months Ended
Dec. 31, 2021
Additional Financial Information Disclosure [Abstract]  
Schedule of cash and cash equivalents
Cash and cash equivalents at December 31, 2021 and 2020 were as follows:
(In millions)20212020
Cash$222.8 $158.2 
Other short-term investments464.9 487.7 
Total cash and cash equivalents$687.7 $645.9 
Schedule of other non-operating income (expense)
Other income (expense) for the years ended December 31, 2021, 2020, and 2019 was as follows:
(in millions)202120202019*
Rent, royalty income and other income$1.1 $0.9 $2.9 
Gains from disposal of property, plant and equipment, net2.9 2.9 90.7 
Net equity income (loss) on joint ventures (See Note 7)0.1 (7.0)(10.7)
Gain (loss) on sales of businesses, net (See Note 6)13.8 — (7.1)
Joint venture restructuring and impairment charges (See Note 7)— (2.4)(11.4)
Adjustment to indemnification for conditional ARO costs (See Note 8)— 4.3 — 
Other0.3 0.1 — 
Total other income (expense), net$18.2 $(1.2)$64.4 
* The year ended December 31, 2019 reflects impacts from the change in inventory accounting method, as described in Note 1 of the Notes to the Consolidated Financial Statements.