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Stock-Based Compensation Plans - Schedule of Impact on Earnings (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-Based Compensation |  |  |
Stock-based compensation expense | $ (44.3) | $ (41.7) | $ (48.9)
Income tax benefit from stock-based compensation expense | 7.5 | 6.9 | 8.5
Net income impact | $ (36.8) | $ (34.8) | $ (40.4)
Earnings per share: |  |  |
Basic and diluted (USD per share) | $ (0.09) | $ (0.08) | $ (0.09)

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