Short-term Debt and Credit Lines (Revolving Loan Facility and Credit Lines) (Details) In Millions, unless otherwise specified						12 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2012 Euro-Based Revolving Loan Facility Revolving Credit Facility USD ($)	Dec. 31, 2012 Euro-Based Revolving Loan Facility Revolving Credit Facility EUR (€)	Dec. 31, 2011 Euro-Based Revolving Loan Facility Revolving Credit Facility USD ($)	Dec. 31, 2011 Euro-Based Revolving Loan Facility Revolving Credit Facility EUR (€)	Dec. 31, 2012 Line of Credit USD ($)	May 23, 2012 Line of Credit USD ($)	May 22, 2012 Line of Credit USD ($)	Dec. 31, 2011 Line of Credit
Line of Credit Facility
Revolving Loan Facility		$ 3.3		$ 1.6
Line of Credit Facility, Maximum Borrowing Capacity		5.3	4.0	5.2	4.0	67.4	125.0	90.0
Line of Credit Facility, Interest Rate at Period End (as a Percentage)		1.56%	1.56%	2.52%	2.52%				1.35%
Line of Credit Facility, Current Borrowing Capacity	61.6
Line of Credit Period (in years)						3 years
Line of Credit Facility, Expected Decrease						16.7
Notes, Loans and Financing Receivable, Purchase of Company Shares	30.0
Commercial Paper, Maximum Amount Issuable	$ 70.0