Financial Information for Guarantor Subsidiaries and Non-Guarantor Subsidiaries - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items]
Assets	$ 7,732.2	$ 8,215.1	$ 9,721.1	$ 4,109.6
Liabilities	9,227.7		9,717.2
Deferred debt issuance costs	171.4		203.1
Net deferred tax assets, noncurrent	20.7		20.4
Net deferred tax liabilities, noncurrent	228.2		562.3
Current deferred tax liabilities	$ 0.0		0.0
Parent company's percentage ownership of guarantors (as a percent)	100.00%
Guarantor Subsidiaries
New Accounting Pronouncement, Early Adoption [Line Items]
Assets	$ 5,587.1		7,344.3
Guarantor Subsidiaries | Restatement Adjustment
New Accounting Pronouncement, Early Adoption [Line Items]
Assets			546.0
Liabilities			466.3
Equity attributable to noncontrolling interest			1.8
Non-Guarantor Subsidiaries
New Accounting Pronouncement, Early Adoption [Line Items]
Assets	2,011.9		2,492.5
Non-Guarantor Subsidiaries | Restatement Adjustment
New Accounting Pronouncement, Early Adoption [Line Items]
Assets			20.7
New accounting pronouncement, effect of early adoption
New Accounting Pronouncement, Early Adoption [Line Items]
Net deferred tax assets, noncurrent			1.8
Net deferred tax liabilities, noncurrent			71.0
Net deferred tax assets, current	72.8
Current deferred tax liabilities	4.5
Other assets | New accounting pronouncement, effect of early adoption
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred debt issuance costs	$ (171.4)		$ (203.1)