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Fair Value Measurements (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2021 USD ($) investment | Nov. 30, 2020 USD ($) | Aug. 31, 2021 USD ($) investment | Aug. 31, 2020 USD ($) | Aug. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 491.3 |  | $ 491.3 | $ 560.7 |
Investments in debt and equity securities | $ 5.3 |  | $ 5.3 | 6.0 |
Number of investments | investment | 1 |  | 1 |  |
Debt Securities | $ 4.0 |  | $ 4.0 |  |
Asset impairments | 2.0 | $ 4.0 | 6.0 | 8.8 | $ 0.0
Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt and equity securities | 5.3 |  | 5.3 | 6.0 |
Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt and equity securities | 5.3 |  | 5.3 | 6.0 |
Senior unsecured public notes, net of unamortized discount and deferred costs | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 494.3 |  | 494.3 | 0.0 |
Senior unsecured public notes, net of unamortized discount and deferred costs | Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 496.5 |  | 496.5 | 0.0 |
Borrowings under Term Loan Facility | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 395.0 |
Borrowings under Term Loan Facility | Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 395.0 |
Industrial revenue bond | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 4.0 |
Industrial revenue bond | Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 4.0 |
Bank loans | Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 2.1 |
Bank loans | Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Carrying and estimated fair value of financial instruments | 0.0 |  | 0.0 | 2.3 |
Fair value measured on recurring basis | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 491.3 |  | $ 491.3 | $ 560.7 |

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