Supplemental Consolidated Cash and Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash	$ 38.3		$ 21.8
Restricted cash	1.1		0.5
Total cash and restricted cash reported in the Consolidated Balance Sheets	39.4	$ 41.2	$ 22.3	$ 25.5
Cash paid (recovered) during the three months for interest	0.6	1.4
Cash paid (recovered) during the three months for income taxes	$ (0.1)	$ (0.7)