Additional Financial Information (Schedule Of Payables And Other Current Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Additional Information [Line Items]
Property and equipment, gross	$ 1,164.0	$ 1,182.4
Less: Accumulated depreciation	(884.8)	(838.5)
Property and equipment, net	279.2	343.9
Accounts payable	50.6	41.9
Accrued taxes	21.2	42.0
Accrued payroll-related expenses	85.6	87.1
Derivative Liabilities	6.1	11.2
Accrued expenses, other	85.7	67.4
Restructuring and exit costs	5.5	1.8
Deferred revenue and government grants	31.1	46.3
Payables and other current liabilities, total	285.8	297.7
Foreign currency translation adjustments	36.4	14.1
Pension liability, net of tax benefit of $35.1 and $35.7	(58.3)	(59.3)
Unrealized gain (loss) on hedging activities, net of tax (expense) benefit of ($7.1) and $1.0	11.4	(1.5)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10.5)	(46.7)
Accumulated Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Tax	35.1	35.7
Accumulated Other Comprehensive Income Loss Cumulative Changes in Net Gain Loss from Cash Flow Hedges Tax	(7.1)	1.0
Land [Member]
Additional Information [Line Items]
Property and equipment, gross	12.7	18.4
Building [Member]
Additional Information [Line Items]
Property and equipment, gross	107.7	221.8
Leasehold Improvements [Member]
Additional Information [Line Items]
Property and equipment, gross	180.6	160.2
Equipment [Member]
Additional Information [Line Items]
Property and equipment, gross	524.1	478.1
Software [Member]
Additional Information [Line Items]
Property and equipment, gross	305.5	276.4
Construction in Progress [Member]
Additional Information [Line Items]
Property and equipment, gross	$ 33.4	$ 27.5