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Taxation (Rollforward of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits      
Balance as of January 1 $ 216.3 $ 207.8 $ 355.2
Increases based on tax positions related to the current year 34.3 27.0 20.3
Decreases based on tax positions taken in the current year 0.0 0.0 0.0
Increases for tax positions taken in prior years 0.5 3.9 64.2
Decreases for tax positions taken in prior years (17.8) (30.6) (211.0)
Acquisition related items 29.5 17.9 0.0
Decreases resulting from settlements with the taxing authorities (24.4) (1.2) (9.4)
Decreases as a result of expiration of the statute of limitations (2.4) (4.4) (0.6)
Foreign currency translation adjustments 0.3 (4.1) (10.9)
Balance as of December 31 $ 236.3 $ 216.3 $ 207.8