Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended				0 Months Ended	1 Months Ended
	Jul. 31, 2013	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Jul. 02, 2013 IPO [Member]	Jul. 31, 2013 IPO Over-Allotment [Member]	Jul. 31, 2013 IPO Over-Allotment [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Issued			0	0
Stock Issued During Period, Shares, New Issues					23,250,000	3,487,500
Share Price					$ 17.00		$ 17.00
Proceeds from Issuance Initial Public Offering	$ 424.7
Stockholders' Equity Note, Stock Split, Conversion Ratio		143.0299613
Common shares, par value			$ 0.01	$ 0.01
Preferred Stock, Shares Authorized			100,000,000	0
Preferred Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01
Preferred Stock, Shares Outstanding			0	0
Common shares, shares authorized			1,000,000,000	286,100,000