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Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 21, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt, including current maturities | $ 987.0 | $ 988.0 |
Less current portion | (4.0) | (4.0) |
Less unamortized debt discount and debt issuance fees | (7.6) | (7.9) |
Total long-term debt | 975.4 | 976.1 |
Total gross long-term debt held in escrow | 2,445.2 | 1,254.2 |
Less current portion | (60.0) | 0.0 |
Less unamortized debt issuance fees | (39.0) | (23.5) |
Long-term debt held in escrow | 2,346.2 | 1,230.7 |
Secured Debt | Senior Secured Term Loan B Facility due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt, including current maturities | 387.0 | 388.0 |
Secured Debt | Senior Secured Term Loan B Facility due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total gross long-term debt held in escrow | 1,000.0 | 0.0 |
Secured Debt | Senior Secured Term Loan A Facility due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Total gross long-term debt held in escrow | 200.0 | 0.0 |
Senior Notes | 5.50% Senior Notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt, including current maturities | $ 600.0 | 600.0 |
Stated interest rate of debt | 5.50% |  |
Senior Notes | 6.375% Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Total gross long-term debt held in escrow | $ 500.0 | 500.0 |
Stated interest rate of debt | 6.375% |  | 6.375%
Senior Notes | 4.625% Senior Notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Total gross long-term debt held in escrow | $ 745.2 | $ 754.2 |
Stated interest rate of debt | 4.25% |  | 4.625%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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