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Share Repurchases	12 Months Ended
Share Repurchases	Dec. 31, 2019
Equity [Abstract]
Share Repurchases	Share Repurchases On May 25, 2017, our Board of Directors authorized a share repurchase program, which allowed us to purchase up to $200.0 million of our common stock through open market repurchases, negotiated transactions, or other means, in accordance with applicable securities laws and other restrictions. This program was funded with cash on hand and cash flows from operating activities. During 2018, we repurchased 2.7 million shares of our common stock under the program for an aggregate cost of $175.0 million and an average price per share of $64.94. During 2017, we repurchased 0.3 million shares of our common stock under the program for an aggregate cost of $25.0 million and an average price per share of $79.75. We utilized all $200.0 million authorized under this share repurchase program. On November 29, 2018, our Board of Directors authorized another share repurchase program, which allows us to purchase up to $300.0 million of our common stock through open market repurchases, negotiated transactions, or other means, in accordance with applicable securities laws and other restrictions. During 2018, we did not repurchase any shares of our common stock under this program. During 2019, we repurchased 0.9 million shares of our common stock under the program for an aggregate cost of $50.0 million and an average price per share of $56.19.