Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2020
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure	Stockholders’ Equity Common Stock Dividends Our board of directors declared a dividend of $0.075 per share on February 27, 2020, May 13, 2020 and August 5, 2020, to holders of record on March 13, 2020, May 28, 2020 and August 20, 2020, respectively. We paid dividends of $14.2 million, $14.3 million and $14.3 million on March 30, 2020, June 12, 2020 and September 4, 2020, respectively. Portions of the dividends declared are payable as dividend equivalents to employees who hold restricted stock units when those units vest. Any determination to pay dividends in the future will be at the discretion of our board of directors and will depend upon results of operations, financial condition, contractual restrictions, restrictions imposed by applicable law and other factors our board of directors deems relevant. We currently have capacity and intend to continue to pay a quarterly dividend, subject to approval by our board. While we expect to continue to pay dividends at this time, if circumstances deteriorate, we would consider recommending that our board temporarily reduce or suspend our dividend. Treasury Stock On February 13, 2017, our board of directors authorized the repurchase of up to $300.0 million of our common stock over the next 3 years. Our board of directors removed the three-year time limitation on February 8, 2018. To date, we have repurchased $133.5 million of our common stock and have the ability to repurchase the remaining $166.5 million. We have no obligation to repurchase additional shares, and the timing, actual number and value of the shares that are repurchased, if any, will be at the discretion of management and will depend on a number of factors, including market conditions, the cost of repurchasing shares, the availability of alternative investment opportunities, liquidity, and other factors deemed appropriate. Repurchases may be suspended, terminated or modified at any time for any reason. Any repurchased shares will have the status of treasury shares and may be used, if and when needed, for general corporate purposes. While the existing share repurchase program remains authorized by the board of directors, given the uncertainties arising from the COVID-19 pandemic, we do not intend to repurchase additional shares in the short term. We may resume share repurchases in the future at any time, depending upon market conditions, our capital needs and other factors. During the first quarter of 2020, 0.9 million outstanding employee restricted stock units vested and became taxable to the employees. The employees used 0.3 million shares of the vested stock to satisfy their payroll tax withholding obligations in a net share settlement arrangement whereby the employees received 0.6 million of the shares and gave TransUnion the remaining 0.3 million shares that we have recorded as treasury stock. We remitted cash equivalent to the $32.1 million vest date value of the treasury stock to the respective governmental agencies in settlement of the employee withholding tax obligations. On occasion, as other stock units vest or stock options are exercised throughout the year, employees use shares of stock to satisfy their payroll tax withholding obligations in a net settlement arrangement and we remit the equivalent value of those shares to the respective governmental agencies. Preferred Stock As of September 30, 2020 and December 31, 2019, we had 100.0 million shares of preferred stock authorized, and no preferred stock issued or outstanding.