Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 U.K. Tax Law Change [Member]	Jul. 17, 2012 U.K. Tax Law Change [Member]	Sep. 30, 2012 Ontario, Canada Tax Law Change [Member]	Jun. 20, 2012 Ontario, Canada Tax Law Change [Member]	Sep. 30, 2011 Michigan Tax Law Change [Member]	Sep. 30, 2012 resolution of prior period item [Member]	Sep. 30, 2012 U.K. and Canada tax law change [Member]	Sep. 30, 2012 UK and Canada [Member]	Sep. 30, 2011 Michigan and Illinois tax law change [Member]	Sep. 30, 2011 Illinois Tax Law Change [Member]	Jan. 13, 2011 Illinois Tax Law Change [Member]
Income Taxes (Textuals) [Abstract]
Gross unrecognized tax benefits (excluding the federal benefit received from state positions)	$ 59.0		$ 59.0		$ 69.2
Decrease in unrecognized tax benefits related to federal, state and foreign tax positions	2.5		2.5
Statutory Income Tax Rate Prior							25.00%
Statutory Income Tax Rate Current							24.00%
Corporate income tax rate prior to tax law change									10.00%							4.80%
Corporate income tax rate subsequent to tax law change									11.50%							7.00%
U.K. Statutory Tax Rate effective April 1, 2013							23.00%
Effective income tax rate from continuing operations	35.60%	35.00%	34.00%	40.00%
Changes In Tax Law Impact On Net Earnings						$ 0.9		$ 0.7		$ 5.4	$ 5.0	$ 1.6		$ 6.6	$ 1.2
Tax law change percent impact on effective rate						0.90%					2.20%		0.70%	3.20%