Basis of Presentation Equity Offering (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Schedule of Stock Issuance [Line Items]
Proceeds from Issuance of Common Stock			$ 781.6	$ 0.0
Share Issuance - June 2016 [Domain]
Schedule of Stock Issuance [Line Items]
Common Stock, Shares Issued in Period	23,000
Proceeds from Issuance of Common Stock	$ 413.0
Share Issuance - March 2016 [Domain]
Schedule of Stock Issuance [Line Items]
Common Stock, Shares Issued in Period		37,950
Proceeds from Issuance of Common Stock		$ 368.6