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Goodwill and Other Intangibles - Schedule of other intangible assets subject to amortization (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Feb. 28, 2026
Feb. 28, 2025
May 31, 2025
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance other intangibles subject to amortization $ 85.8 $ 8.2 $ 8.2
Additions 0.0 85.3 85.3
Amortization expense (8.4) (8.1) (11.2)
Foreign currency translation 2.2 (4.1) 3.5
Total other intangibles subject to amortization, net of accumulated amortization of $24.8, $24.1 and $22.5, respectively 79.6 81.3 85.8
Accumulated amortization of intangible assets 58.7 47.2 50.3
Total other intangibles not subject to amortization 2.1 2.1 2.1
Total other intangibles $ 81.7 $ 83.4 $ 87.9