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Shareholders' Equity (Notes) | 9 Months Ended
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Sep. 30, 2017
Shareholders' Equity [Abstract] |
Stockholders' Equity Note Disclosure [Text Block] | On April 25, 2017, the Board of Directors of the Company approved a new common stock repurchase program of up to $250.0 million. The new program replaced the prior $150.0 million program that was authorized in February 2016 and had unused authorization of $114.6 million. The new authorized amount included and was not in addition to any unspent amount remaining under the prior authorization. Repurchases may be made at management’s discretion from time to time on the open market (either with or without a 10b5-1 plan) or through privately negotiated transactions. Share repurchases result in the shares being retired, and the cost of the shares acquired are treated as a reduction from common stock and retained earnings. The repurchase program has no time limit and may be suspended or discontinued at any time. On June 9, 2017, we entered into an agreement with an affiliate of The Duchossois Group, Inc. ("TDG"), a related party, to repurchase 1,000,000 shares of the Company's common stock for $158.78 per share in a privately negotiated transaction. The aggregate purchase price was $158.8 million. For the nine months ended September 30, 2017, including the repurchase of 1,000,000 shares from TDG, we have repurchased 1,077,029 shares of our common stock under the April 2017 stock repurchase program at a total cost of $171.7 million. We had approximately $78.3 million of repurchase authority remaining under this program at September 30, 2017. During the nine months ended September 30, 2017, we also repurchased 53,721 shares of our common stock in conjunction with the February 2016 stock repurchase program at a total cost of $7.8 million.

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- Definition Shareholders' Equity [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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