Supplemental Guarantor Information - Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Guarantor Information [Line Items]
Comprehensive income	$ 608.3	$ 567.0	$ 346.4
Reportable Legal Entities | Parent Guarantor
Supplemental Guarantor Information [Line Items]
Comprehensive income	608.3	567.0	346.4
Reportable Legal Entities | Subsidiary Issuer
Supplemental Guarantor Information [Line Items]
Comprehensive income	608.7	567.9	346.4
Reportable Legal Entities | Guarantor Subsidiaries
Supplemental Guarantor Information [Line Items]
Comprehensive income	797.8	671.2	578.2
Reportable Legal Entities | Non-Guarantor Subsidiaries
Supplemental Guarantor Information [Line Items]
Comprehensive income	31.1	79.6	(49.0)
Reportable Legal Entities | Affiliated Entity
Supplemental Guarantor Information [Line Items]
Comprehensive income	0.0	0.0	0.0
Consolidating Adjustments
Supplemental Guarantor Information [Line Items]
Comprehensive income	$ (1,437.6)	$ (1,318.7)	$ (875.6)