Consolidated Statement of Equity (Unaudited) In Millions, except Share data, unless otherwise specified	Total USD ($)		Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Retained Earnings (Accumulated Deficit) [Member] USD ($)	Accumulated Other Comprehensive Income [Member] USD ($)	Noncontrolling Interest [Member] USD ($)	KWE [Member] USD ($)	KWE [Member] Additional Paid-in Capital [Member] USD ($)	KWE [Member] Noncontrolling Interest [Member] USD ($)
Balance at Dec. 31, 2013	$ 818.9			$ 0	$ 801.3	$ (42.2)	$ 9.2	$ 50.6
Balance, common shares (in shares) at Dec. 31, 2013	82,592,607			82,592,607
Balance, preferred shares (in shares) at Dec. 31, 2013			132,550
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares, net	190.7				190.7
Issuance of common stock (in shares)				9,201,250
Shares forfeited	0
Shares forfeited (in shares)				(2,475)
Repurchase and retirement of common stock	(2.6)				(2.6)
Repurchase and retirement of common stock (in shares)				(108,255)
Stock compensation expense	3.4				3.4
Other comprehensive income:
Unrealized foreign currency translation gain, net of tax	21.6						2.8	18.8
Unrealized forward contract foreign currency loss, net of tax	(10.4)						(10.4)
Preferred stock dividends	(4.1)					(4.1)
Common stock dividends	(16.4)	[1]				(16.4)
Net income	113.6					50.9		62.7
Consolidation of noncontrolling interests (Note 4)	291.8							291.8
Acquisition of KWE shares from noncontrolling interest holders									(16.8)		(16.8)
Contributions from noncontrolling interests	8.6							8.6	1,409.5	(6.5)	1,416.0
Distributions to noncontrolling interests	(13.5)							(13.5)
Balance at Jun. 30, 2014	2,794.3				986.3	(11.8)	1.6	1,818.2
Balance, common shares (in shares) at Jun. 30, 2014	91,683,127			91,683,127
Balance, preferred shares (in shares) at Jun. 30, 2014			132,550
Balance at Mar. 31, 2014
Other comprehensive income:
Net income	63.7
Acquisition of KWE shares from noncontrolling interest holders									(10.0)
Balance at Jun. 30, 2014	$ 2,794.3
Balance, common shares (in shares) at Jun. 30, 2014	91,683,127
Balance, preferred shares (in shares) at Jun. 30, 2014			132,550

[1] $0.0001 par value per share, 200,000,000 and 125,000,000 shares authorized as of June 30, 2014 and 2013