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Equity (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Dividends Payable [Line Items] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | [1] |  | $ 0.885 |  | $ 0.885 |  |
Dividends, Common Stock, Cash | [1] |  | $ 300,800,000 |  | $ 300,000,000 |  |
Common stock repurchased during period, shares |  |  |  |  |  | 0.3 |
Purchases of capital stock |  |  |  |  |  | $ 24,460,000 | $ 29,490,000
Common Stock [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends Payable, Date Declared | [1] |  | May 20, 2016 |  | Feb. 18, 2016 |  |
Dividends Payable, Date to be Paid | [1] |  | Jun. 30, 2016 |  | Mar. 31, 2016 |  |
Dividends Payable, Date of Record | [1] |  | Jun. 17, 2016 |  | Mar. 18, 2016 |  |
Mandatory Convertible Preferred stock [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends Payable, Date Declared |  | Dec. 16, 2015 |  |  | Mar. 22, 2016 |  |
Dividends Payable, Date to be Paid |  | Feb. 01, 2016 |  |  | May 02, 2016 |  |
Dividends Payable, Date of Record |  | Jan. 16, 2016 |  |  | Apr. 15, 2016 |  |
Preferred Stock, Dividends, Per Share, Cash Paid |  | $ 1.1250 | $ 1.1250 | [2] | $ 1.1250 |  |
Dividends, Preferred Stock, Cash |  | $ 11,000,000 | $ 11,000,000 | [2] | $ 11,000,000 |  |
Mandatory Convertible Preferred stock [Member] | Paid subsequent to quarter end [Member] |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Dividends Payable, Date Declared | [2] |  | Jun. 28, 2016 |  |  |  |
Dividends Payable, Date to be Paid | [2] |  | Aug. 01, 2016 |  |  |  |
Dividends Payable, Date of Record | [2] |  | Jul. 15, 2016 |  |  |  |
[1] | Inclusive of dividends accrued for holders of unvested restricted stock units and payments of previously accrued dividends for holders of restricted stock units that have vested during the six months ended June 30, 2016.
[2] | Represents amount paid on August 1, 2016 based on holders of record on July 15, 2016.

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