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Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | $ 180.6 | $ 143.6 | $ 471.4 | $ 366.4
Consolidating Adjustments |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | (410.6) | (330.0) | (1,089.5) | (886.4)
Parent Guarantor | Reportable Legal Entities |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | 180.6 | 143.6 | 471.4 | 366.4
Subsidiary Issuer | Reportable Legal Entities |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | 180.7 | 143.6 | 471.7 | 366.4
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | 215.0 | 162.4 | 587.8 | 453.6
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | 14.9 | 24.0 | 30.0 | 66.4
Co-Issuer | Reportable Legal Entities |  |  |  |
Supplemental Guarantor Information [Line Items] |  |  |  |
Comprehensive income (loss) | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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