Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	May 31, 2022	May 31, 2021	Jun. 01, 2019
New accounting pronouncements adopted
Operating lease ROU assets	$ 73.0	$ 75.8
Operating lease liabilities	57.4	59.9
Other liabilities	14.9	25.4
Retained earnings	$ 820.4	$ 741.7
Cumulative effect adjustment | ASC 842
New accounting pronouncements adopted
Retained earnings			$ 2.5
Cumulative effect adjustment | ASC 842 | Right of use including discontinued operations
New accounting pronouncements adopted
Operating lease ROU assets			123.2
Operating lease liabilities			116.8
Cumulative effect adjustment | ASC 842 | Held for sale or Disposed | Right of use including discontinued operations
New accounting pronouncements adopted
Operating lease ROU assets			26.6
Operating lease liabilities			$ 25.3