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Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 07, 2021 | May 08, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 31, 2021 | Aug. 31, 2019 | Aug. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  | $ 4.9 | $ 6.0 | $ 13.1 | $ 32.3 |  |  |
Dividend declared per share | $ 1.26 | $ 1.09 |  |  |  |  |  |  |
Dividend declared date | May 07, 2021 | May 08, 2020 |  |  |  |  |  |  |
Dividend payable date | Jun. 15, 2021 | Jun. 15, 2020 |  |  |  |  |  |  |
Dividends Payable, Date of Record | Jun. 01, 2021 | Jun. 01, 2020 |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 4,000,000.0 | 6,000,000.0 | 6,000,000.0
Shares repurchased (in shares) |  |  |  |  |  | 900,000 |  |  |
Total cost of shares repurchased |  |  |  |  |  | $ 63.8 |  |  |
August 2021 Authorization |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares remaining authorized for repurchase (in shares) |  |  | 4.0 |  | 4.0 |  |  |  |
August 2019 Authorization |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  | 1,500,000 | 100,000 |  |  |
Total cost of shares repurchased |  |  |  |  | $ 150.1 |  |  |  |
Shares remaining authorized for repurchase (in shares) |  |  | 1,900,000 |  | 1,900,000 |  |  |  |
August 2018 Authorization |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  |  |  |  |  | 800,000 |  |  |
Shares remaining authorized for repurchase (in shares) |  |  | 0 |  | 0 |  |  |  |
Non-Controlling Interests |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  | $ 0.1 | $ 0.1 | $ 1.0 | $ 0.9 |  |  |

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