Consolidated Statements of Changes in Equity (Parenthetical) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Class A [Member] | |||
| Proceeds from issuance of Class A common shares, net of offering costs | $ 0.0 | $ 0.0 | $ 4.8 |