Taxation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes on continuing operations	28.00%	2.00%	18.00%	4.00%
Increase in tax expense	$ 60.0		$ 37.9
Adjustment to provisional estimate	$ 15.0		7.1
Repatriation toll charge			$ 45.0	$ 31.0
Effect of remeasurement on effective tax rate	8.00%		2.00%

Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act of 2017, Percent

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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit

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Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Provisional Income Tax Expense Benefit

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Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08.(h)(2))
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-Name Accounting Standards Codification
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-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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