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Goodwill (Details) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) reportingUnit	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) reportingUnit	Dec. 31, 2020 USD ($)
Goodwill [Line Items]
Goodwill		$ 65.1	$ 15.4	$ 10.5
Goodwill impairment	$ 49.7	$ 37.2	$ 49.7
Weighted average discount rate | Discounted cash flow analysis
Goodwill [Line Items]
Weighted average discount rate (percent)		13.60%	12.70%
Materials and Construction Segment
Goodwill [Line Items]
Goodwill		$ 56.4	$ 6.7	$ 1.8
Number of Reporting Units | reportingUnit	3		3
Goodwill impairment			$ 49.7

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