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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS    
Accrued liabilities for intangible assets $ 14.3 $ 14.4
Accounts payable for purchase of available-for-sale short-term investment 8.7 7.9
Accounts payable for purchases of equipment 2.0 2.6
Accounts receivable included sales of available-for-sale short-term investments 5.9  
Accounts payable for purchases of common stock held in treasury $ 2.6 $ 76.1