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Financing Arrangements (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Short-term debt
Short-term debt at June 30, 2013 and December 31, 2012 was as follows:
 
June 30,
2013
December 31,
2012
Variable-rate lines of credit for certain of the Company’s foreign subsidiaries with
  various banks with an interest rate of 1.33% at June 30, 2013 and interest rates
  ranging from 0.61% to 2.28% at December 31, 2012.
$
7.0

$
14.3

Short-term debt
$
7.0

$
14.3
Long-term debt
Long-term debt at June 30, 2013 and December 31, 2012 was as follows:
 
June 30,
2013
December 31,
2012
Fixed-rate Medium-Term Notes, Series A, mature at various dates through
May 2028, with interest rates ranging from 6.74% to 7.76%
$
175.0

$
175.0

Fixed-rate Senior Unsecured Notes, maturing on September 15, 2014, with an
interest rate of 6.0%
249.9

249.9

Variable-rate State of Ohio Water Development Revenue Refunding Bonds,
maturing on November 1, 2025 (0.14% at June 30, 2013)
12.2

12.2

Variable-rate State of Ohio Air Quality Development Revenue Refunding Bonds,
maturing on November 1, 2025 (0.23% at June 30, 2013)
9.5

9.5

Variable-rate State of Ohio Pollution Control Revenue Refunding Bonds, maturing
on June 1, 2033 (0.23% at June 30, 2013)
8.5

8.5

Other
0.4

9.6

 
$
455.5

$
464.7

Less current maturities
0.2

9.6

Long-term debt
$
455.3

$
455.1