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Business Combinations, Divestitures and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Detail) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Inventories, net | $ 19.5 | $ 53.1
Investment land | 38.0 | 32.7
Other assets |  | 16.4
Total current assets held for sale | 57.5 | 102.2
Property, plant and equipment | 130.0 | 226.0
Intangible assets, excluding goodwill | 208.5 | 264.9
Operating lease right-of-use assets | 14.0 | 18.1
Goodwill | 35.7 | 109.3
Other assets | 5.4 | 4.6
Valuation allowance for loss on sale | (5.4) | (6.0)
Total noncurrent assets held for sale | 388.2 | 616.9
Lease obligations | (5.2) | (7.5)
Total current liabilities held for sale | (5.2) | (7.5)
Asset retirement obligations | (19.8) | (31.5)
Lease obligations | (8.5) | (22.0)
Other liabilities | (0.8) |
Total noncurrent liabilities held for sale | (29.1) | (53.5)
Continuing Operations |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Investment land | 38.0 | 32.7
Total current assets held for sale | 38.0 | 32.7
Discontinued Operations |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Inventories, net | 19.5 | 53.1
Other assets |  | 16.4
Total current assets held for sale | 19.5 | 69.5
Property, plant and equipment | 130.0 | 226.0
Intangible assets, excluding goodwill | 208.5 | 264.9
Operating lease right-of-use assets | 14.0 | 18.1
Goodwill | 35.7 | 109.3
Other assets | 5.4 | 4.6
Valuation allowance for loss on sale | (5.4) | (6.0)
Total noncurrent assets held for sale | 388.2 | 616.9
Lease obligations | (5.2) | (7.5)
Total current liabilities held for sale | (5.2) | (7.5)
Asset retirement obligations | (19.8) | (31.5)
Lease obligations | (8.5) | (22.0)
Other liabilities | (0.8) |
Total noncurrent liabilities held for sale | $ (29.1) | $ (53.5)

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