Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 187.0	$ 180.6	$ 527.7	$ 471.4
Consolidating Adjustments
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(437.9)	(410.6)	(1,227.6)	(1,089.5)
Parent Guarantor | Reportable Legal Entities
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	187.0	180.6	527.7	471.4
Subsidiary Issuer | Reportable Legal Entities
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	187.1	180.7	528.0	471.7
Guarantor Subsidiaries | Reportable Legal Entities
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	246.7	215.0	656.1	587.8
Non-Guarantor Subsidiaries | Reportable Legal Entities
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	4.1	14.9	43.5	30.0
Affiliated Entity | Reportable Legal Entities
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 0.0	$ 0.0	$ 0.0	$ 0.0