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Stockholders' Equity - Share Repurchase Activity (Details) - Common Stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 18, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Shares Repurchased (in shares)		5.0	4.1	3.3
Average Price (in dollars per share)		$ 86.35	$ 88.73	$ 150.31
Subsequent Event
Class of Stock [Line Items]
Shares Repurchased (in shares)	1.2
Stock repurchased during period, value	$ 151.9

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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