Income Taxes (Details 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the beginning and ending of unrecognized tax benefits
Balance at January 1	$ 131.5	$ 110.1	$ 125.9
Additions based on tax positions related to the current period	10.5	20.8	11.9
Additions for tax positions of prior periods	19.5	86.1	71.7
Reductions for tax positions of prior periods	(49.9)	(23.4)	(92.1)
Statute expirations	(1.2)	(1.6)	(1.9)
Settlements	(42.5)	(60.5)	(5.4)
Balance at December 31	$ 67.9	$ 131.5	$ 110.1

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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