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Equity (Narrative) (Details) - USD ($) |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2018 | Jan. 31, 2018 | Mar. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 28, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  | 23,732,835 |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, average price per share (in USD per share) |  |  |  | $ 47.39 |  |  |  |  |  |  |  |  |  |  |
Shares cancelled (in shares) |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, remaining amount under the program |  |  | $ 145,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  | 4,076,603 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, average price per share (in USD per share) |  |  | $ 52.40 |  |  |  |  |  |  |  |  |  |  |  |
Shares cancelled (in shares) | 6,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary share capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  | $ 200,000,000 | $ 250,000,000 | $ 300,000,000 | $ 350,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 400,000,000
Shares cancelled (in shares) |  |  |  | 20,000,000 | 15,563,862 | 9,698,588 |  |  |  |  |  |  |  |  |
Ordinary share capital | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |

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