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Goodwill and Other Intangibles - Schedule of other intangible assets subject to amortization (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Nov. 30, 2021
Nov. 30, 2020
May 31, 2021
Finite-lived Intangible Assets [Roll Forward]      
Beginning balance other intangibles subject to amortization $ 8.4 $ 10.5 $ 10.5
Additions 0.0 0.0  
Adjustments 0.0 0.0 (0.5)
Amortization expense (1.0) (1.2) (2.2)
Foreign currency translation (0.3) 0.4 0.6
Total other intangibles subject to amortization, net of accumulated amortization of $24.8, $24.1 and $22.5, respectively 7.1 9.7 8.4
Accumulated amortization of intangible assets 33.3 31.3 32.3
Total other intangibles not subject to amortization 2.1 2.1 2.1
Total other intangibles $ 9.2 $ 11.8 $ 10.5