Acquisitions and Divestitures (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Income Statement reclassified results of discontinued operation
(Loss) income from discontinued operations, net of tax	$ (1.1)	$ 0.7	$ (1.7)	$ 0.9
Assets and liabilities reclassified as held for sale
Accounts receivable, net	1,133.3	1,106.9	1,133.3	1,106.9	972.8
Other liabilities	401.7	452.0	401.7	452.0	449.8
Broadcasting Group [Member]
Income Statement reclassified results of discontinued operation
Revenue	22.4	23.6	66.8	67.6
Costs and expenses	23.2	21.5	67.7	64.5
(Loss) income before taxes on income	(0.8)	2.1	(0.9)	3.1
Provision for taxes on income	0.3	1.4	0.8	2.2
(Loss) income from discontinued operations, net of tax	(1.1)	0.7	(1.7)	0.9
Assets and liabilities reclassified as held for sale
Accounts receivable, net	18.5	16.3	18.5	16.3	17.8
Property and equipment, net	24.5	26.5	24.5	26.5	27.5
Other intangible assets, net	45.9	48.2	45.9	48.2	47.6
Other assets	11.8	12.4	11.8	12.4	10.2
Assets held for sale	100.7	103.4	100.7	103.4	103.1
Accounts payable and accrued expenses	6.2	5.9	6.2	5.9	9.4
Other liabilities	8.4	9.5	8.4	9.5	9.3
Liabilities held for sale	$ 14.6	$ 15.4	$ 14.6	$ 15.4	$ 18.7