Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Parent company's percentage ownership of guarantors (as a percent)	100.00%
Assets	$ 9,703.4us-gaap_Assets		$ 9,995.2us-gaap_Assets
Liabilities	9,892.8us-gaap_Liabilities		9,991.3us-gaap_Liabilities
Net loss from Consolidated Statements of Operations and Comprehensive Loss	(86.4)	(45.0)
Net cash provided by (used in) operating activities	77.8	83.3
Guarantor Subsidiaries
Assets	7,237.8		7,397.0
Net loss from Consolidated Statements of Operations and Comprehensive Loss	(134.1)	(5.0)
Net cash provided by (used in) operating activities	(163.4)	56.7
Non-Guarantor Subsidiaries
Assets	2,331.9		2,505.4
Net loss from Consolidated Statements of Operations and Comprehensive Loss	5.9	30.0
Net cash provided by (used in) operating activities	135.5	69.8
Restatement Adjustment \| Guarantor Subsidiaries
Assets		546.0
Liabilities		466.3
Stockholders liability		0.6
Net loss from Consolidated Statements of Operations and Comprehensive Loss		0.6
Net cash provided by (used in) operating activities		1.9
Restatement Adjustment \| Non-Guarantor Subsidiaries
Assets		4.0
Liabilities		4.0
Stockholders liability		466.3
Net loss from Consolidated Statements of Operations and Comprehensive Loss		0.6
Net cash provided by (used in) operating activities		$ 4.0

The parent's direct and indirect ownership percentage of the subsidiaries that are guarantors of the entity's debt.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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