CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS SUPPLEMENTAL DISCLOSURE OF NON-CASH ITEMS (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS NON-CASH SUPPLEMENTAL DATA
Accrued liabilities for intangible assets	$ 13.0	$ 14.3
Included in accounts payable related to additions to other intangible assets	$ 2.0
Accounts payable on short-term investments		$ 20.3