Stock Repurchase Plan Stock Repurchase Plan (Details) $ in Millions |
12 Months Ended |
---|---|
Dec. 31, 2017
USD ($)
shares
| |
Stock Repurchase Plan [Abstract] | |
Authorized common stock repurchase amount | $ 1,250.0 |
Common stock repurchased, shares | shares | 36,994,653 |
Common stock repurchased, purchase price | $ 994.8 |
X | ||||||||||
- Definition Stock Repurchase Plan [Abstract] No definition available.
|
X | ||||||||||
- Definition Amount of stock repurchase plan authorized. No definition available.
|
X | ||||||||||
- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|