CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS
Accrued liabilities for intangible assets	$ 15.4	$ 9.4	$ 14.0
Accounts payable for purchases of equipment	16.9	2.9	0.6
Accounts receivable included sales of available-for-sale short-term investments	$ 3.0	$ 15.2	$ 0.0