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Equity (Narrative) (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2015 | Mar. 15, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | May 31, 2015 | Feb. 28, 2015
Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 400,000,000 | $ 750,000,000 | $ 250,000,000
Share repurchase program, authorized amount increase |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Approximate price per share |  |  |  | $ 38.62 |  |  |  |  |  |  |  |  |
Ordinary shares, acquired |  |  |  | 25,012,978 |  |  |  |  |  |  |  |  |
Share cancellation, shares |  |  |  | 15,563,862 |  |  |  |  |  |  |  |  |
AIG [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate price per share |  | $ 47.77 |  |  |  |  |  |  |  |  |  |  |
Total consideration for repurchase of common stock |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, expense |  |  |  | $ 11,200,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |
Approximate price per share |  |  | $ 44.63 |  |  |  |  |  |  |  |  |  |
Ordinary shares, acquired |  |  | 5,000,005 |  |  |  |  |  |  |  |  |  |
Share cancellation, shares | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Ordinary Share Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued for acquisition |  |  |  |  |  | 97,560,976 |  |  |  |  |  |  |
Share cancellation, shares |  |  |  | 15,563,862 | 9,698,588 |  |  |  |  |  |  |  |

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