Revenue Recognition (Net Contract Assets (Liabilities)) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023
Revenue Recognition and Deferred Revenue [Abstract]
Contract assets			$ 2.0	$ 2.2
Contract liabilities - current			(4.2)	(4.7)
Contract liabilities - noncurrent			(8.1)	(7.5)
Total			$ (10.3)	$ (10.0)
Contract with Customer, Liability, Revenue Recognized	$ 2.8	$ 7.0