Debt (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended			12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Credit Agreement	Feb. 29, 2008 Credit Agreement Minimum	Feb. 29, 2008 Credit Agreement Maximum	Dec. 31, 2012 Credit Agreement Prime or Federal Funds	Dec. 31, 2012 Credit Agreement LIBOR	Dec. 31, 2012 Credit Agreement Adjusted LIBOR	Dec. 31, 2012 Credit Agreement Federal Funds	Feb. 29, 2008 Credit Agreement Federal Funds	Dec. 31, 2012 Credit Agreement Prime rate	Dec. 31, 2011 U.S. Dollar term loan under the Amended Credit Agreement	Feb. 29, 2008 U.S. Dollar term loan under the Amended Credit Agreement	Dec. 31, 2012 U.S. Dollar revolving loans under the Amended Credit Agreement	Dec. 31, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement	Feb. 29, 2008 U.S. Dollar revolving loans under the Amended Credit Agreement	Dec. 31, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement Minimum	Dec. 31, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement Maximum	Dec. 31, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement Adjusted LIBOR	Dec. 31, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement Federal Funds	Dec. 31, 2012 US Dollar notes under the Note Purchase Agreement	Dec. 31, 2012 Capital lease obligations and other loans	Dec. 31, 2011 Capital lease obligations and other loans	Dec. 31, 2012 Other revolving loans
Debt
Total debt	$ 337.2	$ 303.1										$ 82.5		$ 93.0	$ 216.5						$ 240.0	$ 4.2	$ 4.1
Current portion of long-term debt	(1.3)	(83.7)
Total long-term debt, less current portion	335.9	219.4
Maximum commitment														250.0	250.0	230.0								185.5
Term facility													$ 150.0
Variable interest rate base						prime rate or the federal funds rate	LIBOR	adjusted LIBOR	federal funds rate		prime rate
Interest rate added to base rate (as a percent)				0.40%	1.25%					0.50%							0.80%	1.65%	1.00%	0.50%
Facility fee (as a percent)				0.10%	0.20%												0.20%	0.35%
Weighted Average Interest Rate (as a percent)														1.40%
Maximum leverage ratio			3.0
Minimum interest coverage ratio			3.0