Taxation (Components of Pre-tax Income) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Income from continuing operations before income taxes and equity in (losses)/ earnings of equity method investees	$ 486.1	$ 1,385.8	$ 3,336.2
Ireland
Income Tax Contingency [Line Items]
Republic of Ireland	214.3	(11.4)	1,472.0
United States
Income Tax Contingency [Line Items]
Pre-tax income from continuing operations, foreign	(75.3)	975.8	1,025.9
Rest of the world
Income Tax Contingency [Line Items]
Pre-tax income from continuing operations, foreign	$ 347.1	$ 421.4	$ 838.3

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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