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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, 2019 | May 31, 2018 | May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | $ 4.5 | $ 3.3 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
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, Property, plant and equipment, net | 0.9 | 11.2 | 5.7
Goodwill |  |  | 2.8
Impairment, Goodwill |  |  | 0.0
Prepublication assets | 6.0 |  | 0.0
Impairment, Prepublication assets | 0.0 |  | 1.1
Intangible assets | 4.9 | 3.1 | 6.8
Impairment, Intangible assets | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Property, Plant and Equipment, Net [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Goodwill [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions |  |  | 2.8
Fair Value, Measurements, Nonrecurring [Member] | Prepublication Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | 6.0 |  | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Other Intangible Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Intangible assets acquired | 5.1 | 3.3 | 7.0
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Goodwill |  |  | 0.0
Prepublication assets | 0.0 |  | 0.0
Intangible assets | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Goodwill |  |  | 0.0
Prepublication assets | 0.0 |  | 0.0
Intangible assets | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Property, plant and equipment, net | 0.0 | 0.0 | 0.0
Goodwill |  |  | 2.8
Prepublication assets | 6.0 |  | 0.0
Intangible assets | $ 5.1 | $ 3.3 | $ 7.0

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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