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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2021
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | $ 4.9 | $ 32.8 | $ 28.7 | $ 29.8
Income tax benefit recognized for stock-based compensation | (0.8) | (4.4) | (4.2) | (4.4)
Stock-based compensation cost, net of tax | 4.1 | 28.4 | 24.5 | 25.4
Stock options |  |  |  |
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | 0.2 | 0.0 | 0.3 | 1.8
Nonvested Stock Awards [Member] |  |  |  |
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | 3.5 | 24.9 | 25.7 | 19.3
Income tax benefit recognized for stock-based compensation | (3.1) | (2.8) | (2.5) | (2.0)
Performance Shares [Member] |  |  |  |
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | 0.5 | 7.0 | 2.6 | 6.1
Stock Appreciation Rights (SARs) |  |  |  |
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | 0.3 | 0.2 | (0.8) | 1.1
Restricted Stock Units (RSUs) |  |  |  |
Equity-based compensation plans |  |  |  |
Stock-based compensation expense | $ 0.4 | $ 0.7 | $ 0.9 | $ 1.5

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