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Debt and Credit Arrangements - Interest Expense And Financing Cost Amortization (Details) - Revolving Credit Facility - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Debt Instrument |  |  |  |
Interest expense | $ 5.6 | $ 2.9 | $ 11.4 | $ 8.0
Financing costs amortization | 0.8 | 0.1 | 1.2 | 0.4
Term loan |  |  |  |
Debt Instrument |  |  |  |
Interest expense | 4.6 |  | 4.6 |
Senior secured revolving credit facility |  |  |  |
Debt Instrument |  |  |  |
Interest expense | $ 1.0 |  | 6.8 |
Senior secured revolving credit facility due 2022 |  |  |  |
Debt Instrument |  |  |  |
Interest expense |  | $ 2.9 |  | $ 8.0
Financing costs amortization |  |  | $ 0.2 |

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