Stockholders' Equity and Stock-based Compensation (Share Repurchase Program) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Oct. 24, 2019	Oct. 30, 2018	Feb. 05, 2018
Share-based Compensation [Abstract]
Stock Repurchase Program, Authorized Amount		$ 100.0	$ 100.0	$ 100.0
Treasury Stock, Shares, Acquired	1,026,455
Treasury Stock, Value, Acquired, Cost Method	$ 86.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 128.5

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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