Stockholders' Equity Stockholders' Equity (Notes)

3 Months Ended

Dec. 31, 2018

Stockholders' Equity Attributable to Parent [Abstract]

Stockholders' Equity Note Disclosure [Text Block]

Stockholders' Equity

Share Repurchases

On April 29, 2013, our Board of Directors approved a share repurchase program for up to $500.0 million, which was increased by $500.0 million on April 29, 2015. On August 1, 2018, our Board of Directors approved an additional $500.0 million under our share repurchase program. Under the terms of the share repurchase program, we have the ability to repurchase shares through a variety of methods, which may include open market purchases, privately negotiated transactions, block trades, accelerated stock repurchase transactions, or any combination of such methods. The share repurchase program does not require us to acquire any specific number of shares and may be modified, suspended, extended or terminated by us at any time without prior notice. The timing and the amount of any purchases will be determined by management based on an evaluation of market conditions, capital allocation alternatives, and other factors.

For the three months endedDecember 31, 2018, we repurchased 4.9 million shares of our common stock for $75.2 million under the program. There were no share repurchases for the three months endedDecember 31, 2017. Since the commencement of the program, we have repurchased an aggregate of 61.0 million shares for $1,017.8 million. The amount paid in excess of par value is recognized in additional paid in capital. Shares were retired upon repurchase. As of December 31, 2018, approximately $482.2 million remained available for future repurchases under the program.