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Debt And Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Debt Instrument |  |
Interest accretion of convertible notes discount | $ 2.5 | $ 3.3
Financing costs amortization | 0.3 | 0.3
Convertible Debt | Convertible Notes, due 2024 |  |
Debt Instrument |  |
Interest accretion of convertible notes discount | 1.7 |
Debt instrument, interest expense | 0.6 |
Interest expense | 2.3 |
Financing costs amortization | 0.2 |
Convertible Debt | Convertible Notes, Due 2018 |  |
Debt Instrument |  |
Interest accretion of convertible notes discount | 0.8 | 3.3
Debt instrument, interest expense | 0.6 | 1.3
Interest expense | 1.4 | 4.6
Financing costs amortization | $ 0.0 | $ 0.2

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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