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Debt And Credit Arrangements Tables (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Instrument [Line Items]  
Schedule of Debt [Table Text Block]
The following table represents the components of our borrowings:
 
December 31,
 
2017
 
2016
Convertible notes due November 2024:
 
 
 
Principal amount
$
258.8

 
$
—

Unamortized discount
(57.6
)
 
—

Unamortized debt issuance costs
(5.1
)
 
—

Convertible notes due November 2024, net of unamortized discount and debt issuance costs
196.1

 
—

 
 
 
 
Convertible notes due August 2018:
 
 
 
Principal amount
57.1

 
250.0

Unamortized discount
(1.9
)
 
(21.9
)
Unamortized debt issuance costs
(0.1
)
 
(1.1
)
Convertible notes due August 2018, net of unamortized discount and debt issuance costs
55.1

 
227.0

 
 
 
 
Senior secured revolving credit facility due November 2022
239.0

 
—

Foreign facilities
7.9

 
13.2

Total debt, net of unamortized discount and debt issuance costs
498.1

 
240.2

Less: current maturities (1)
(58.9
)
 
(6.5
)
Long-term debt
$
439.2

 
$
233.7

_______________
(1) 
Current maturities at December 31, 2017 includes $55.1 of Convertible notes due August 2018, net of unamortized discount and debt issuance costs.
Schedule of Maturities of Long-term Debt [Table Text Block]
annual maturities of debt at December 31, 2017, are as follows: 
Year
Amount
2018 (1)
$
60.9

2019
4.1

2022
239.0

Thereafter
258.8

Total
$
562.8

_______________
(1) 
Includes the $57.1 fully accreted amount of our 2018 Notes and $3.8 current maturities related to foreign facilities.
Cash paid for
Convertible Notes, due 2024 [Member]  
Debt Instrument [Line Items]  
Schedule of Interest Accretion, Loss on Extinguishment, and Amortization of Financing Costs [Table Text Block]
The following table summarizes interest accretion of the 2024 Notes discount, 1.0% contractual interest coupon and financing costs amortization associated with the 2024 Notes:
 
Year Ended December 31, 2017
2024 Notes, interest accretion of convertible notes discount
$
1.1

2024 Notes, 1.0% contractual interest coupon
0.4

2024 Notes, total interest expense
$
1.5

 
 
2024 Notes, financing costs amortization
$
0.1
Convertible Notes, Due 2018 [Member]  
Debt Instrument [Line Items]  
Schedule of Interest Accretion, Loss on Extinguishment, and Amortization of Financing Costs [Table Text Block]
The following table summarizes interest accretion of the 2018 Notes discount, 2.0% contractual interest coupon, loss on extinguishment of debt and financing costs amortization associated with the 2018 Notes:
 
Year Ended December 31,
 
2017
 
2016
 
2015
2018 Notes, interest accretion of convertible notes discount
$
11.8

 
$
12.5

 
$
11.5

2018 Notes, 2.0% contractual interest coupon
4.3

 
5.0

 
5.0

2018 Notes, total interest expense
$
16.1

 
$
17.5

 
$
16.5

 
 
 
 
 
 
2018 Notes, loss on extinguishment of debt, bond cost portion
4.3

 
—

 
—

2018 Notes, write off of unamortized debt issuance costs
0.4

 
—

 
—

2018 Notes, total loss on extinguishment of debt (1)
$
4.7

 
$
—

 
$
—

 
 
 
 
 
 
2018 Notes, financing costs amortization
$
0.6

 
$
0.7

 
$
0.7