XML 100 R63.htm IDEA: XBRL DOCUMENT v3.24.0.1
Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Balance at beginning of year $ 4.5 $ 5.5 $ 12.2
Additions based on tax positions related to the current year 0.5 0.2 0.9
Additions for tax positions of prior years 0.2    
Additions for tax positions of prior years   (0.2) (0.2)
Reductions as a result of a lapse in the statute of limitations (0.2) (1.0) (2.9)
Reductions as a result of audit/other settlements 0.0 0.0 (4.5)
Balance at end of year $ 5.0 $ 4.5 $ 5.5