|
Consolidated Statements of Changes in Equity (Parenthetical) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Proceeds from issuance of offering costs | $ 4.9 | $ 9.4 | $ 3.1 |
|
Class A [Member] | Common Stock and Paid-in Capital [Member]
|
|||
| Proceeds from issuance of offering costs | $ 4.9 | $ 9.4 | $ 3.1 |