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Stock-Based Compensation Plans - Schedule of Impact on Earnings (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	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)

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Earnings Per Share Basic and Diluted Impact

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