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Segment Information - Reconciliation of Segment Operating Income (Loss) to Consolidated Income (Loss) From Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ 27.7 $ 49.4 $ 39.3 $ 127.6
Interest expense (2.4) (15.2) (20.9) (46.9)
Other expense, net (32.5) (49.2) (134.3) (108.5)
Cost-reduction charges (13.2) (0.2) (48.6) (5.4)
Total loss from continuing operations before income taxes (7.2) (15.0) (115.9) (27.8)
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) 45.6 49.5 73.2 136.7
Segment Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Interest expense (2.4) (15.2) (20.9) (46.9)
Other expense, net (32.5) (49.2) (134.3) (108.5)
Cost-reduction charges (13.8) (0.2) (30.8) (5.4)
Corporate and eliminations        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Operating income (loss) $ (4.1) $ 0.1 $ (3.1) $ (3.7)