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Stockholders' Equity Shares Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 01, 2018
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	902,340
Treasury Stock Acquired, Average Cost Per Share	$ 69.46
Treasury Stock, Value, Acquired, Par Value Method	$ 62.7
2018 Stock Repurchase Program [Member] [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 37.3	$ 100.0

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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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Amount of stock repurchase plan authorized.

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

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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