Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheet (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 56.0	$ 28.5	$ 113.9	$ 29.8
Receivables, less allowance	201.0us-gaap_AccountsReceivableNetCurrent	217.5us-gaap_AccountsReceivableNetCurrent
Other current assets	168.9	109.3
Total current assets	425.9us-gaap_AssetsCurrent	355.3us-gaap_AssetsCurrent
Property and equipment, net	770.4us-gaap_PropertyPlantAndEquipmentNet	782.9us-gaap_PropertyPlantAndEquipmentNet
Goodwill	2,146.2us-gaap_Goodwill	2,154.2us-gaap_Goodwill
Intangible assets	620.4us-gaap_FiniteLivedIntangibleAssetsNet	633.2us-gaap_FiniteLivedIntangibleAssetsNet
Investments in subsidiaries	0	0
Other assets	94.3us-gaap_OtherAssetsNoncurrent	98.0us-gaap_OtherAssetsNoncurrent
Intercompany	0out_IntercompanyReceivables	0out_IntercompanyReceivables
Total assets	4,057.2us-gaap_Assets	4,023.6us-gaap_Assets
Total current liabilities	249.3us-gaap_LiabilitiesCurrent	255.2us-gaap_LiabilitiesCurrent
Long-term debt	2,301.7us-gaap_LongTermDebtNoncurrent	2,198.3us-gaap_LongTermDebtNoncurrent
Deferred income tax liabilities, net	14.6	17.2
Asset retirement obligation	36.4	36.6
Deficit in excess of investment in subsidiaries	0	0
Other liabilities	67.2us-gaap_OtherLiabilitiesNoncurrent	70.8us-gaap_OtherLiabilitiesNoncurrent
Intercompany	0out_IntercompanyPayables	0out_IntercompanyPayables
Total liabilities	2,669.2us-gaap_Liabilities	2,578.1us-gaap_Liabilities
Total stockholder's equity	1,388.0	1,445.5	1,285.5
Total liabilities and stockholders’ equity	4,057.2	4,023.6
Parent Company
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Receivables, less allowance	0	0
Other current assets	0	0
Total current assets	0	0
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets	0	0
Investments in subsidiaries	1,388.0	1,445.5
Other assets	0	0
Intercompany	0	0
Total assets	1,388.0	1,445.5
Total current liabilities	0	0
Long-term debt	0	0
Deferred income tax liabilities, net	0	0
Asset retirement obligation	0	0
Deficit in excess of investment in subsidiaries	0	0
Other liabilities	0	0
Intercompany	0	0
Total liabilities	0	0
Total stockholder's equity	1,388.0	1,445.5
Total liabilities and stockholders’ equity	1,388.0	1,445.5
Subsidiary Issuer
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	20.4	11.5	70.4	0
Receivables, less allowance	0	0
Other current assets	5.7	5.3
Total current assets	26.1	16.8
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets	0	0
Investments in subsidiaries	3,659.2	3,613.0
Other assets	31.7	31.2
Intercompany	0	0
Total assets	3,717.0	3,661.0
Total current liabilities	27.6	17.9
Long-term debt	2,301.4	2,197.6
Deferred income tax liabilities, net	0	0
Asset retirement obligation	0	0
Deficit in excess of investment in subsidiaries	0	0
Other liabilities	0	0
Intercompany	0	0
Total liabilities	2,329.0	2,215.5
Total stockholder's equity	1,388.0	1,445.5
Total liabilities and stockholders’ equity	3,717.0	3,661.0
Guarantor Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	15.1	8.8	24.0	2.1
Receivables, less allowance	174.6	186.5
Other current assets	138.5	83.5
Total current assets	328.2	278.8
Property and equipment, net	683.1	683.3
Goodwill	2,047.8	2,050.6
Intangible assets	620.3	633.0
Investments in subsidiaries	190.8	208.1
Other assets	55.7	59.5
Intercompany	70.5	75.1
Total assets	3,996.4	3,988.4
Total current liabilities	188.2	219.1
Long-term debt	0.3	0.7
Deferred income tax liabilities, net	0	0
Asset retirement obligation	28.6	28.3
Deficit in excess of investment in subsidiaries	2,271.2	2,167.5
Other liabilities	61.5	64.4
Intercompany	58.6	62.9
Total liabilities	2,608.4	2,542.9
Total stockholder's equity	1,388.0	1,445.5
Total liabilities and stockholders’ equity	3,996.4	3,988.4
Non-Guarantor Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	20.5	8.2	19.5	27.7
Receivables, less allowance	26.4	31.0
Other current assets	24.7	20.5
Total current assets	71.6	59.7
Property and equipment, net	87.3	99.6
Goodwill	98.4	103.6
Intangible assets	0.1	0.2
Investments in subsidiaries	0	0
Other assets	6.9	7.3
Intercompany	58.6	62.9
Total assets	322.9	333.3
Total current liabilities	33.5	18.2
Long-term debt	0	0
Deferred income tax liabilities, net	14.6	17.2
Asset retirement obligation	7.8	8.3
Deficit in excess of investment in subsidiaries	0	0
Other liabilities	5.7	6.4
Intercompany	70.5	75.1
Total liabilities	132.1	125.2
Total stockholder's equity	190.8	208.1
Total liabilities and stockholders’ equity	322.9	333.3
Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	0	0
Receivables, less allowance	0	0
Other current assets	0	0
Total current assets	0	0
Property and equipment, net	0	0
Goodwill	0	0
Intangible assets	0	0
Investments in subsidiaries	(5,238.0)	(5,266.6)
Other assets	0	0
Intercompany	(129.1)	(138.0)
Total assets	(5,367.1)	(5,404.6)
Total current liabilities	0	0
Long-term debt	0	0
Deferred income tax liabilities, net	0	0
Asset retirement obligation	0	0
Deficit in excess of investment in subsidiaries	(2,271.2)	(2,167.5)
Other liabilities	0	0
Intercompany	(129.1)	(138.0)
Total liabilities	(2,400.3)	(2,305.5)
Total stockholder's equity	(2,966.8)	(3,099.1)
Total liabilities and stockholders’ equity	$ (5,367.1)	$ (5,404.6)

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