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Debt (Schedule of Loss on Debt Extinguishment) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 10, 2017
Debt Instrument [Line Items] |  |  |  |
Loss (gain) on debt extinguishment | $ 0.0 | $ 2.6 | $ (14.1) |
Financing Agreement, April 2014 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loss (gain) on debt extinguishment |  | 1.1 |  |
Financing Arrangement, February 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  |  |  | $ 4.7
Loss (gain) on debt extinguishment |  | 1.5 |  |
Discharge of Debt | Financing Arrangement, February 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | 1.5 |  |
Long-term Debt | Financing Arrangement, February 2017 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuance costs |  | $ 3.2 |  |

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