Supplemental Consolidated Cash and Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Elements [Abstract]
Cash	$ 19.8		$ 29.0
Restricted cash	0.6		0.7
Total cash and restricted cash reported in the Consolidated Balance Sheets	20.4	$ 27.4	$ 29.7	$ 42.8
Interest	11.0	1.2
Income taxes	$ 0.0	$ 0.1