Debt (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Credit Agreement Debt [Member]	Feb. 29, 2008 Credit Agreement Debt [Member] Minimum	Feb. 29, 2008 Credit Agreement Debt [Member] Maximum	Feb. 29, 2008 Credit Agreement Debt [Member] Federal Funds	Dec. 31, 2011 U.S. Dollar term loan under the Amended Credit Agreement	Dec. 31, 2010 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, 2011 U.S. Dollar revolving loans under the Amended Credit Agreement	Dec. 31, 2010 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, 2011 Capital lease obligations	Dec. 31, 2010 Capital lease obligations	Dec. 31, 2011 Other revolving loans
Debt
Total debt	$ 303.1	$ 301.0					$ 82.5	$ 110.6		$ 216.5	$ 185.5						$ 4.1	$ 4.9
Short-term borrowings		(185.5)
Current portion of long-term debt	(83.7)	(28.9)
Total debt, less current portion	219.4	86.6
Maximum commitment										250.0		230.0							178.7
Term facility									$ 150.0
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)							2.80%			1.40%
Maximum leverage ratio			3.0
Minimum interest coverage ratio			3.0