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Common Stock and Treasury Stock	3 Months Ended
Common Stock and Treasury Stock	Mar. 31, 2021
Equity [Abstract]
Common Stock and Treasury Stock	Common Stock and Treasury Stock In 2005, the board approved a stock repurchase program authorizing the Company, as market and business conditions warrant, to acquire its common stock and periodically authorize additional funds for the program. In February 2018, the board approved the repurchase of the Company's common stock of up to $200.0 million, in place of the remaining purchase amounts previously authorized. There were no shares repurchased during the three months ended March 31, 2021. Under the program to date, the Company has repurchased 46,357,495 shares for approximately $612.3 million. As of March 31, 2021, the maximum remaining amount authorized for purchase under the stock repurchase program was $112.1 million.