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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill (for each period a consolidated balance sheet is presented) allocated to the Company's reportable segments starting with the year ended December 31, 2019 and continuing to the year ended December 31, 2020 were as follows (in millions):
Materials & ConstructionCommercial Real EstateTotal
Carrying amount of goodwill:
Gross amount of goodwill$93.6 $8.7 $102.3 
Accumulated impairment losses(37.2)— (37.2)
Balance, January 1, 2019$56.4 $8.7 $65.1 
Impairment losses(49.7)— (49.7)
Carrying amount of goodwill:
Gross amount of goodwill93.6 8.7 102.3 
Accumulated impairment losses(86.9)— (86.9)
Balance, December 31, 2019$6.7 $8.7 $15.4 
Gross amount of goodwill included in disposal(7.1)— (7.1)
Accumulated impairment losses included in disposal2.2 — 2.2 
Carrying amount of goodwill:
Gross amount of goodwill86.5 8.7 95.2 
Accumulated impairment losses(84.7)— (84.7)
Balance, December 31, 2020$1.8 $8.7 $10.5