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Stock Repurchase (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Repurchase
Common stock authorized for repurchase, maximum (in shares)	250.0
Common stock remaining number of shares authorized to repurchase	139.6
Common stock repurchased (in shares)	0.4	1.7	1.0
Common stock repurchased, value	$ 20.0	$ 94.6	$ 54.4
Weighted average price per share of common stock (in dollars per share)	$ 51.87	$ 56.86	$ 56.25
Payment of income tax obligation on employee equity awards	$ 6.2	$ 9.3	$ 13.6

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- Definition

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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