Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Rollforward of Goodwill (Details)

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Goodwill and Other Intangible Assets - Rollforward of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Goodwill [Roll Forward]    
Balance, beginning $ 194.9  
Balance, ending 192.6 $ 194.9
Europe Building Products    
Goodwill [Roll Forward]    
Balance, beginning 194.9 199.5
Foreign exchange impact $ (2.3) (4.6)
Balance, ending   $ 194.9