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Discontinued Operations - Schedule of Reconciliation of Major Line Items Constituting Pretax Income (Loss) from Discontinued Operations to Net Income (Loss) from Discontinued Operations (Detail) - Interior Products [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Disposal Group Including Discontinued Operation Income Statement Disclosures [Line Items]        
Net sales $ 109.1 $ 261.4 $ 357.9 $ 521.1
Cost of products sold (80.3) (189.4) (264.1) (378.6)
Selling, general and administrative (21.0) (55.8) (77.9) (109.4)
Depreciation and amortization (0.2) (21.6) (13.1) (37.6)
Other income (loss)   0.2 0.1 0.4
Loss on sale (2.4)   (357.8)  
Pretax income (loss) from discontinued operations 5.2 (5.2) (354.9) (4.1)
Provision for (benefit from) income taxes 1.0 (3.9) (91.2) (3.4)
Net income (loss) from discontinued operations $ 4.2 $ (1.3) $ (263.7) $ (0.7)