Supplemental Consolidated Cash and Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash	$ 28.3		$ 21.8
Restricted cash	1.1		0.5
Total cash and restricted cash reported in the Consolidated Balance Sheets	29.4	$ 82.4	$ 22.3	$ 25.5
Cash paid (recovered) during the six months for interest	6.8	8.2
Cash paid (recovered) during the six months for income taxes	$ 13.4	$ (0.6)