Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Intangible Assets									$ 0.0	$ 0.0	$ 194.4
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent													$ 88.2
Prepaid Expense, Current	$ 15.0				$ 13.1				15.0	13.1		$ 6.4
Deferred gain on sale of wireless spectrum licenses - discontinued operations								$ (112.6)	0.0	(112.6)	0.0
Gain on Liabilities and Other Assets transferred in Sale of Business Affiliate and Productive Assets							$ (15.9)		0.0	(15.9)	0.0
Revenue, Net	285.3	$ 312.4	$ 299.2	$ 288.9	289.3	$ 299.8	285.8	292.9	1,185.8	1,167.8	1,161.5
Selling, General and Administrative Expense									218.7	219.1	204.2
Depreciation and amortization									182.2	141.6	127.6
Impairment of assets									0.0	0.0
Sale Leaseback Transaction, Current Period Gain Recognized									0.0	(6.5)	(22.9)
Costs and Expenses									1,092.8	1,039.8	984.6
Operating income (loss)	10.5	25.5	27.4	29.6	25.0	36.2	29.7	37.1	93.0	128.0	176.9
Other expense (income), net									(7.6)	2.6	5.1
Income tax expense (benefit)									61.1	159.8	81.4
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0.3	$ 0.0	$ 0.0	$ 0.0	2.1	$ 1.0	$ 10.9	$ 48.9	0.3	62.9	(42.1)
Restructuring Reserve	7.4				0.9				7.4	0.9
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	0.0				5.4				0.0	5.4
Impairment of assets									0.0	0.0	12.1
Capital expenditures									(286.4)	(283.6)	(182.3)
Repayment of debt									(759.3)	(531.7)	(376.5)
Operating lease expense									9.6	10.1	7.4
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Intangible Assets									0.0	0.0	194.4
Revenue, Net									0.0	4.4	132.8
Cost of Goods and Services Sold									0.0	12.0	66.9
Selling, General and Administrative Expense									0.0	2.2	19.5
Depreciation and amortization									0.0	28.6	103.4
Restructuring charges									0.0	3.3
Impairment of assets									0.0	0.0	7.5
Transaction costs									0.0	0.0	3.2
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property									0.0	(0.4)	0.0
Sale Leaseback Transaction, Current Period Gain Recognized									0.0	(6.5)	(22.9)
Costs and Expenses									0.0	39.2	193.9
Operating income (loss)									0.0	(34.8)	(61.1)
Interest Income (Expense), Net									0.0	(1.7)	2.8
Other expense (income), net									(0.3)	(2.3)	2.2
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									0.3	97.7	(66.1)
Income tax expense (benefit)									0.0	34.8	(24.0)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									0.3	62.9	(42.1)
Restructuring Reserve	0.0				4.7				0.0	4.7
Disposal Group, Including Discontinued Operation, Other Liabilities, Current	0.0				0.7				0.0	0.7
Disposal Group, Including Discontinued Operation, Liabilities, Current	$ 0.0				$ 5.4				0.0	5.4
Impairment of assets									0.0	0.0	7.5
Increase (Decrease) in Prepaid Rent									0.0	3.2	(3.2)
Payments for Restructuring									(4.4)	(14.5)	(2.4)
Capital expenditures									0.0	0.0	(6.5)
Repayment of debt									$ 0.0	(0.3)	(23.5)
Operating lease expense										$ 1.4	6.4
Contract Termination [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges											13.1
Employee Severance [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges											3.2
Lease Abandonment [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges											16.3
Senior Notes due 2020 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Extinguishment of Debt, Amount											$ 22.7