Components of Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets, Net [Abstract]
Postretirement/post-employment benefits	$ 25.3	$ 27.4
Deferred compensation	193.4	191.2
Pension costs	25.8	41.4
Basis differences in fixed assets	(67.5)	(38.5)
Rent	41.1	45.8
Interest	60.9	60.9
Accruals and reserves	29.4	34.8
Allowance for doubtful accounts	10.8	10.8
Basis differences in intangible assets	(408.2)	(412.3)
Investments in equity securities	(8.3)	(2.6)
Tax loss/tax credit carry forwards	354.5	404.4
Restructuring and other reorganization-related costs	0.4	(0.3)
Prepaid expenses	(2.3)	0.0
Other	59.9	59.2
Total Deferred Tax Assets, Net	315.2	422.2
Valuation allowance	(275.1)	(332.2)	$ (467.3)	$ (392.9)
Net Deferred Tax Assets	$ 40.1	$ 90.0