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Equity (Dividends Distributed to the Company's Shareholders) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
March 19, 2015 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend April 29, 2015
Gross amount of the dividend distributed (in millions of $) $ 59.5
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 59.5
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
May 12, 2015 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend June 23, 2015
Gross amount of the dividend distributed (in millions of $) $ 151.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 151.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.12
August 11, 2015 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend September 10, 2015
Gross amount of the dividend distributed (in millions of $) $ 52.5
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 52.5
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
November 11, 2015 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend December 16, 2015
Gross amount of the dividend distributed (in millions of $) $ 84.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 84.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.07
March 15, 2016 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend April 18, 2016
Gross amount of the dividend distributed (in millions of $) $ 67.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 67.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
May 17, 2016 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend June 22, 2016
Gross amount of the dividend distributed (in millions of $) $ 35.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 35.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.03
August 9, 2016 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend September 27, 2016
Gross amount of the dividend distributed (in millions of $) $ 60.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 60.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
November 22, 2016 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend January 4, 2017
Gross amount of the dividend distributed (in millions of $) $ 60.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 60.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.05
February 14, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend April 4, 2017
Gross amount of the dividend distributed (in millions of $) $ 57.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 57.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
May 9, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend June 20, 2017
Gross amount of the dividend distributed (in millions of $) $ 34.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 34.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.03
August 2, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend September 13, 2017
Gross amount of the dividend distributed (in millions of $) $ 32.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 32.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.02
November 7, 2017 [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend December 20, 2017
Gross amount of the dividend distributed (in millions of $) $ 57.0
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 57.0
Amount of the dividend per share (in dollar) | $ / shares $ 0.04
February 13, 2018 (after the reporting date) [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Actual date of distribution of the dividend March 14, 2018 [1]
Gross amount of the dividend distributed (in millions of $) $ 70.0 [1]
Net amount of the distribution (net of the subsidiariy's share) (in millions of $) $ 70.0 [1]
Amount of the dividend per share (in dollar) | $ / shares $ 0.05 [1]
[1] The record date is February 28, 2018 and the payment date is March 14, 2018.