Supplemental Guarantor Information -Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 128.5	$ 50.4	$ 285.1	$ 187.7
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	128.5	50.4	285.1	187.7
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	128.5	50.4	285.1	187.7
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	142.0	129.0	395.0	358.8
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	38.2	(1.2)	38.4	5.6
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	0.0	0.0	0.0	0.0
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(308.8)	(178.2)	(718.5)	(552.1)
Consolidated [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 128.4	$ 50.4	$ 285.1	$ 187.7