Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income (Loss)	$ 100.6	$ 334.8	$ (53.2)
Income (loss) from discontinued operations	72.4	52.3	56.6
Income (loss) from continuing operations	28.2	282.5	(109.8)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88.7	83.7	95.3
Gain on sale of interests in the Cellular Partnerships	0	(265.0)	0
Gain on sale of business	0	(7.0)	0
Asset impairment	88.6	0	181.1
Deferred income tax expense (benefit)	(4.2)	15.5	0.1
Earnings from Cellular Partnerships, net	0	(20.2)	(47.2)
Distributions from Cellular Partnerships	0	30.7	35.7
Stock compensation expense	20.2	14.8	12.1
Changes in assets and liabilities:
Change in receivables	(14.1)	(27.1)	5.0
Change in other current assets	(23.4)	5.2	49.2
Change in deferred charges, net	1.4	(6.1)	0
Change in other assets and liabilities	(28.2)	51.9	(21.6)
Change in payables and other current liabilities	(56.5)	6.5	(15.5)
Other, net	3.2	(4.0)	(5.2)
Net cash provided by operating activities of continuing operations	103.9	161.4	179.2
Net cash used in operating activities of discontinued operations	9.1	35.2	15.0
Net cash provided by operating activities	113.0	196.6	194.2
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(98.4)	(74.8)	(63.0)
Proceeds from sale of interests in the Cellular Partnerships	0	320.0	0
Proceeds from disposition of assets	0	3.1	0
Proceeds from disposition of business	0	10.0	0
Payments to acquire trading securities	0	(22.7)	0
Payments to acquire short-term investments	(83.3)	0	0
Proceeds from maturity of short-term investments	19.0	0	0
Net cash used in investing activities of continuing operations	(162.7)	235.6	(63.0)
Net cash provided by (used in) investing activities of discontinued operations	425.3	(13.5)	63.7
Net cash provided by (used in) investing activities	262.6	222.1	0.7
CASH FLOWS FROM FINANCING ACTIVITIES
Repayments of credit facilities and other debt, net	(66.5)	(86.0)	(312.0)
Repurchase of common shares	(180.8)	(96.8)	(24.9)
Proceeds from exercise of stock options	10.9	3.0	0
Payments of Dividends	(11.2)	0	0
Excess tax benefit from share-based compensation	5.0	0	0
Other, net	0	(3.2)	0
Net cash used in financing activities of continuing operations	(242.6)	(183.0)	(336.9)
Net cash used in financing activities of discontinued operations	(0.1)	0	(3.6)
Net cash used in financing activities	(242.7)	(183.0)	(340.5)
Net increase (decrease) in cash and cash equivalents	132.9	235.7	(145.6)
Cash and cash equivalents at beginning of period	421.8	186.1	331.7
Cash and cash equivalents at end of period	554.7	421.8	186.1
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for interest	13.7	16.7	18.2
Income taxes paid, net of refunds	$ (68.2)	$ (20.6)	$ (16.9)