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Debt And Credit Arrangements Summary of Outstanding Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Nov. 05, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 250.0 |  |  |
Debt, Long-term and Short-term, Combined Amount, Net of Unamortized Debt Issuance Costs and Debt Discounts | 498.1 |  |  | $ 240.2
Current Maturities Of Long Term Debt Including Short Term Debt | 58.9 | [1] |  | 6.5
Long-term Debt, Excluding Current Maturities | 439.2 |  |  | 233.7
Convertible Notes, due 2024 [Member] | Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 258.8 |  |  | 0.0
Debt Instrument, Unamortized Discount | 57.6 |  |  | 0.0
Unamortized Debt Issuance Expense | 5.1 |  |  | 0.0
Convertible Debt | 196.1 |  |  | 0.0
Convertible Notes, Due 2018 [Member] | Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 57.1 |  |  | 250.0
Debt Instrument, Unamortized Discount | 1.9 |  |  | 21.9
Unamortized Debt Issuance Expense | 0.1 |  |  | 1.1
Convertible Debt |  |  | $ 184.7 | 227.0
Convertible Debt, Current | 55.1 |  |  |
Senior Secured Revolving Credit Facility, due 2022 [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Expense | 2.4 |  |  |
Long-term Debt, Gross | 239.0 |  |  |
Senior Secured Revolving Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | 0.0
Foreign Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | $ 7.9 |  |  | $ 13.2
[1] | (1) Current maturities at December 31, 2017 includes $55.1 of Convertible notes due August 2018, net of unamortized discount and debt issuance costs.

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