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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 1,038.0  
Other comprehensive income before reclassifications     6.1 $ (20.7)
Amounts reclassified from AOCL     (0.6) 0.5
Total other comprehensive income/(loss) $ 1.1 $ (16.6) 5.5 (20.2)
Ending Balance 1,092.2   1,092.2  
Accumulated Other Comprehensive Loss [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (145.2) (46.9)
Ending Balance (139.7) (67.1) (139.7) (67.1)
Defined Benefit Pension Plan Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (58.4) 10.7
Other comprehensive income before reclassifications     0.0 0.0
Amounts reclassified from AOCL     (0.6) 0.5
Total other comprehensive income/(loss)     (0.6) 0.5
Ending Balance (59.0) 11.2 (59.0) 11.2
Foreign Currency Translation Items [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (86.8) (57.6)
Other comprehensive income before reclassifications     6.1 (20.7)
Amounts reclassified from AOCL     0.0 0.0
Total other comprehensive income/(loss)     6.1 (20.7)
Ending Balance $ (80.7) $ (78.3) $ (80.7) $ (78.3)