Financing Arrangements (Details 2) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 LIBOR	Dec. 31, 2011 Euro Libor	Dec. 31, 2012 Credit Agreement	Dec. 31, 2012 Base rate loans and swing line loans Minimum	Dec. 31, 2012 Base rate loans and swing line loans Maximum	Dec. 31, 2012 Base rate loans and swing line loans LIBOR	Dec. 31, 2012 Base rate loans and swing line loans Federal funds	Dec. 31, 2012 Eurocurrency rate loans LIBOR Minimum	Dec. 31, 2012 Eurocurrency rate loans LIBOR Maximum
Credit Agreement
Multi-currency borrowing capacity					$ 300
Term of senior unsecured revolving credit facility					5 years
Potential additional borrowing capacity					150
Sublimit on letters of credit					75
Interest rate added to base rate (as a percent)			2.96%	2.96%		0.70%	1.30%			1.70%	2.30%
Interest rate added to base rate (as a percent)								1.00%	0.50%
Unused and available credit under the credit agreement					265.4
Stand-by letters of credit outstanding	$ 34.8	$ 34.9			$ 34.6