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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.