Consolidated Statements Of Operations And Comprehensive Income (Loss) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Revenues	$ 576.9	$ 556.0	$ 1,673.1	$ 1,630.2
Costs and Expenses:
Cost of providing services and products sold	364.7	341.1	1,049.8	982.5
Selling, general and administrative	133.1	140.6	395.5	440.2
Research and development costs	11.6	13.1	38.1	42.3
Depreciation	21.6	24.1	63.9	75.4
Amortization	2.4	2.4	7.2	7.6
Restructuring charges	0	0	0	17.6
Total costs and expenses	533.4	521.3	1,554.5	1,565.6
Operating Income	43.5	34.7	118.6	64.6
Earnings from Cellular Partnerships, net		11.9		36.9
Earnings from Cellular Partnerships, including gain on sale	265.0		285.2
Other income (expense), net	1.2	1.3	9.0	7.9
Interest expense	(3.6)	(4.1)	(12.5)	(15.2)
Income before Income Taxes	306.1	43.8	400.3	94.2
Income tax expense	92.4	8.8	120.0	22.4
Income from continuing operations	213.7	35.0	280.3	71.8
Income from Discontinued Operations, net of tax	0	(6.2)	0	19.7
Net Income	213.7	28.8	280.3	91.5
Other Comprehensive Income (Loss), net of tax:
Foreign currency translation adjustments	(8.9)	3.5	(4.2)	12.6
Unrealized loss on hedging activities	(12.0)	20.6	(15.3)	19.5
Total other comprehensive (loss) income	(20.9)	24.1	(19.5)	32.1
Total Comprehensive Income	$ 192.8	$ 52.9	$ 260.8	$ 123.6
Basic Earnings Per Common Share:
Continuing operations	$ 1.78	$ 0.28	$ 2.32	$ 0.58
Discontinued operations	$ 0.00	$ (0.05)	$ 0.00	$ 0.16
Basic Earnings per Common Share	$ 1.78	$ 0.23	$ 2.32	$ 0.74
Diluted Earnings Per Common Share:
Continuing operations	$ 1.75	$ 0.28	$ 2.28	$ 0.57
Discontinued operations	$ 0.00	$ (0.05)	$ 0.00	$ 0.16
Diluted Earnings per Common Share	$ 1.75	$ 0.23	$ 2.28	$ 0.73
Weighted Average Common Shares Outstanding:
Basic	120.1	123.2	120.9	123.5
Diluted	121.8	125.4	123.0	125.8