Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended		3 Months Ended
	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Paid prior to quarter end [Member]		Jun. 30, 2014 Paid prior to quarter end [Member]		Mar. 31, 2014 Paid prior to quarter end [Member]		Dec. 31, 2013 Paid prior to quarter end [Member]	Dec. 31, 2014 Paid subsequent to quarter end [Member]		Sep. 30, 2014 Paid subsequent to quarter end [Member]		Sep. 30, 2014 Common Stock [Member] Paid prior to quarter end [Member]	Jun. 30, 2014 Common Stock [Member] Paid prior to quarter end [Member]	Mar. 31, 2014 Common Stock [Member] Paid prior to quarter end [Member]	Dec. 31, 2014 Common Stock [Member] Paid subsequent to quarter end [Member]	Jun. 30, 2014 Mandatory Convertible Preferred stock [Member] Paid prior to quarter end [Member]	Mar. 31, 2014 Mandatory Convertible Preferred stock [Member] Paid prior to quarter end [Member]	Dec. 31, 2013 Mandatory Convertible Preferred stock [Member] Paid prior to quarter end [Member]	Dec. 31, 2014 Mandatory Convertible Preferred stock [Member] Paid subsequent to quarter end [Member]	Sep. 30, 2014 Mandatory Convertible Preferred stock [Member] Paid subsequent to quarter end [Member]
Dividends Payable [Line Items]
Dividends Payable, Date Declared															Aug. 08, 2014	May 30, 2014	Feb. 20, 2014		Jun. 25, 2014	Mar. 25, 2014	Dec. 31, 2013		Sep. 26, 2014
Dividends Payable, Date to be Paid															Sep. 19, 2014	Jun. 20, 2014	Mar. 20, 2014	Dec. 31, 2014	Jul. 15, 2014	Apr. 15, 2014	Jan. 14, 2014	Oct. 15, 2014
Dividends Payable, Date of Record															Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 19, 2014	Aug. 01, 2014	May 01, 2014	Feb. 03, 2014	Nov. 03, 2014
Common Stock, Dividends, Per Share, Cash Paid				$ 0.35		$ 0.35		$ 0.35
Dividends, Common Stock, Cash				$ 117,200,000	[1]	$ 117,200,000	[1]	$ 117,200,000	[1]		$ 275,000,000	[1]
Preferred Stock, Dividends, Per Share, Cash Paid						$ 1.1250		$ 1.1250		$ 1.1625			$ 1.1250
Dividends, Preferred Stock, Cash	11,000,000							11,000,000		11,400,000			11,000,000	[2]
Common stock repurchased during period, shares		0.3
Purchases of capital stock		$ 21,778,000	$ 99,217,000

[1] Inclusive of dividends accrued for holders of unvested restricted stock units.

[2] Represents amount paid on November 3, 2014 based on holders of record on October 15, 2014.