Supplemental Guarantor Information -Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 50.4	$ (0.2)	$ 187.7	$ 69.1
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	50.4	(0.2)	187.7	69.1
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	50.4	15.0	187.7	84.2
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	129.0	84.9	358.8	284.3
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(1.2)	4.2	5.6	4.5
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	0	0	0	0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(178.2)	(104.1)	(552.1)	(373.0)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 50.4	$ (0.2)	$ 187.7	$ 69.1