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Fair Value Measurements (Details) - Schedule of non-financial assets measured and recorded at fair value on a non-recurring basis - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset impairments and write downs | $ 11.1 | $ 40.6 | $ 0.9
Additions | 0.0 | 1.6 |
Fair Value, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Impairment of Long-Lived Assets to be Disposed of |  | 0.6 | 0.9
Author advances |  | 0.0 |
Author Advances, Property, plant and equipment, net |  | 1.6 |
Prepublication assets |  | 0.5 |
Prepublication costs |  | 0.8 |
Asset impairments and write downs | 1.5 |  |
Investment acquired |  |  | 6.0
Investments Impairment Loss |  |  | 0.0
Intangible assets |  | 1.5 | 4.9
Impairment, Intangible assets |  | 0.0 | 0.0
Additions |  | 0.0 |
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 8.1 |  |
Fair Value, Nonrecurring | Operating lease right-of-use assets, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Asset impairments and write downs | 9.6 |  |
Additions | 0.0 |  |
Fair Value, Nonrecurring | Property, plant and equipment, net |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 0.0 | 0.0 | 0.0
Fair Value, Nonrecurring | Prepublication assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  | 0.0 |
Fair Value, Nonrecurring | Intangible assets |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Intangible assets acquired |  | 1.6 | 5.1
Fair Value, Nonrecurring | Investment acquired |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  |  | 6.0
Fair Value, Nonrecurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Author advances |  | 0.0 |
Prepublication assets |  | 0.0 |
Investment acquired |  |  | 0.0
Intangible assets |  | 0.0 | 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Author advances |  | 0.0 |
Prepublication assets |  | 0.0 |
Investment acquired |  |  | 0.0
Intangible assets |  | 0.0 | 0.0
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | 0.0 |  |
Fair Value, Nonrecurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Author advances |  | 0.0 |
Prepublication assets |  | 0.5 |
Investment acquired |  |  | 6.0
Intangible assets |  | $ 1.6 | $ 5.1
Operating Lease, Right-Of-Use Asset, Fair Value Disclosure | $ 9.1 |  |

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