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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, 2018 | May 31, 2017 | May 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Additions | $ 3.3 | $ 7.0 |
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 | 11.2 | 5.7 | 7.5
Goodwill |  | 2.8 |
Impairment, Goodwill |  | 0.0 |
Prepublication assets |  | 0.0 | 0.0
Impairment, Prepublication assets |  | 1.1 | 6.9
Intangible assets | 0.0 | 6.8 | 1.9
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 |  | 0.0 | 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 | 3.3 | 7.0 | 2.4
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 |  | 0.0 | 0.0
Intangible assets | $ 0.0 | $ 7.0 | $ 2.4

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