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Credit Agreements - Schedule of Debt Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019 | Apr. 03, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal | $ 825.0 | $ 825.0 |
Debt Issuance Costs, Net | (5.8) | (6.0) |
Debt, Net | 819.2 | 819.0 |
Senior Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 275.0 | 275.0 |
Debt Issuance Costs, Net | (0.6) | (0.6) |
Debt, Net | 274.4 | 274.4 | $ 325.0
5.375% Senior Notes due March 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 250.0 | 250.0 |
Debt Issuance Costs, Net | (1.9) | (2.0) |
Debt, Net | 248.1 | 248.0 |
4.600% Senior Notes Due May 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Principal | 300.0 | 300.0 |
Debt Issuance Costs, Net | (3.3) | (3.4) |
Debt, Net | $ 296.7 | $ 296.6 |

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