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Common Stock Repurchase Program
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Common Stock Repurchase Program COMMON STOCK REPURCHASE PROGRAM 

During the three and six months ended June 30, 2019, the Company repurchased 2.5 million and 4.6 million shares of its common stock at a cost of $55.0 million and $108.5 million, including commissions, respectively. During the three and six months ended June 30, 2018, the Company repurchased 0.4 million and 1.8 million shares of its common stock at a cost of $5.9 million and $25.9 million, including commissions, respectively. As of June 30, 2019, the Company had remaining authorization to repurchase approximately $547.3 million of its common stock, subject to restrictions under its Credit Agreement.