| Date | Acquired | Amount |
|---|---|---|
| May 24, 2017 |
|
$ 600,000,000 |
| Oct 20, 2015 |
|
Undisclosed amount |
| May 05, 2015 |
|
Undisclosed amount |
| Mar 13, 2013 |
|
$ 890,000,000 |
