Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 857.8	$ 350.4	$ 217.0
Settlements with tax authorities	(111.3)	0.0	(3.6)
Reductions for tax positions of prior years	(80.7)	(117.9)	(20.4)
Foreign currency translation	(4.3)	(8.5)
Foreign currency translation			14.1
Additions based on tax positions related to the current year	1.8	180.0	4.5
Additions for tax positions of prior years	1.0	457.4	138.8
Lapse of statute of limitations	0.0	(3.6)	0.0
Balance at December 31	$ 664.3	$ 857.8	$ 350.4

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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