Consolidated Balance Sheets Parenthetical - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Series A preferred shares, par value	$ 0.01	$ 0.01
Series A preferred shares, shares authorized	3,000,000	3,000,000
Temporary Equity, Aggregate Amount of Redemption Requirement	$ 870.0	$ 824.0
Temporary Equity, Liquidation Preference	$ 870.0	$ 824.0
Series A preferred shares, shares issued	866,900	820,000
Series A preferred shares, shares outstanding	866,900	820,000
Stockholders' Equity:
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock shares authorized	100,000,000	100,000,000
Preferred Stock shares issued	0	0
Preferred Stock shares outstanding	0	0
Common Stock par value	$ 0.01	$ 0.01
Common Stock shares authorized	500,000,000	500,000,000
Common Stock shares issued	124,600,000	133,000,000
Common Stock, Shares, Outstanding	124,600,000	133,000,000