Equity - Dividend Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	May. 19, 2015	Sep. 30, 2015	Sep. 30, 2014
Declared
Preferred Stock, Declared		$ 3.1	$ 6.1
Common stock, Declared		39.5	25.0
Total, Declared		42.6	31.1
Paid
Preferred Stock, Paid		3.1	6.1
Common Stock, Paid		34.6	22.3
Total, Paid		$ 37.7	$ 28.4
Common stock, par or stated value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock authorized (in shares)		200,000,000	200,000,000
Common Stock [Member]
Paid
Conversion of preferred stock to common stock (in shares)	8,554,948	8,554,948
Common stock, par or stated value (in dollars per share)	$ 0.0001
Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Paid
Conversion of preferred stock to common stock (in shares)		(100,000)
Series A Preferred Stock [Member]
Declared
Preferred Stock, Declared		$ 1.5	$ 4.5
Paid
Preferred Stock, Paid		1.5	$ 4.5
Series A Preferred Stock [Member] | Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Paid
Preferred stock dividend rate percentage			6.00%
Preferred stock issued (in shares)			100,000
Preferred stock outstanding (in shares)	100,000		100,000
Series B Preferred Stock [Member]
Declared
Preferred Stock, Declared		1.6	$ 1.6
Paid
Preferred Stock, Paid		$ 1.6	$ 1.6
Series B Preferred Stock [Member] | Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Paid
Preferred stock dividend rate percentage		6.45%
Preferred stock issued (in shares)		32,550	32,550
Conversion price of convertible preferred stock (in dollars per share)		$ 10.03	$ 10.20
Preferred stock outstanding (in shares)		32,550	32,550