CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS
Accrued liabilities for intangible assets	$ 14.4	$ 13.0
Accounts payable for purchases of equipment	2.6	0.5
Included in accounts payable related to additions to other intangible assets		$ 2.0
Accounts payable for purchase of available-for-sale short-term investment	7.9
Accounts payable for purchases of common stock held in treasury	$ 76.1