Debt (Details) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended		6 Months Ended		6 Months Ended											6 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Jun. 30, 2012 Revolving credit facility, due 2017 [Member] USD ($)	Dec. 31, 2011 Revolving credit facility, due 2017 [Member] USD ($)	Jun. 30, 2012 Revolving Credit Facility, due 2014 [Member] USD ($)	Dec. 31, 2011 Revolving Credit Facility, due 2014 [Member] USD ($)	Jun. 30, 2012 Series A Floating Rate Notes Due 2012 [Member] USD ($)	Dec. 31, 2011 Series A Floating Rate Notes Due 2012 [Member] USD ($)	Jun. 30, 2012 Series B Floating Rate Notes Due 2015 [Member] USD ($)	Dec. 31, 2011 Series B Floating Rate Notes Due 2015 [Member] USD ($)	Jun. 30, 2012 EURO Note A Due 2013 [Member] USD ($)	Jun. 30, 2012 EURO Note A Due 2013 [Member] EUR (€)	Dec. 31, 2011 EURO Note A Due 2013 [Member] USD ($)	Jun. 30, 2012 EURO Note B Due 2016 [Member] USD ($)	Dec. 31, 2011 EURO Note B Due 2016 [Member] USD ($)	Jun. 30, 2012 Convertible Debt Due 2047 [Member] USD ($)	Dec. 31, 2011 Convertible Debt Due 2047 [Member] USD ($)	Jun. 30, 2012 Term Loan Due 2014 [Member] USD ($)	Dec. 31, 2011 Term Loan Due 2014 [Member] USD ($)	Jun. 30, 2012 Capital leases, due through 2016 [Member] USD ($)	Dec. 31, 2011 Capital leases, due through 2016 [Member] USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 385.5	$ 385.5	$ 349.4	$ 204.9	$ 0	$ 0	$ 6.4	$ 50.0	$ 50.0	$ 25.0	$ 25.0	$ 25.4	€ 20.4	$ 26.3	$ 76.2	$ 79.0	$ 3.1	$ 161.5	$ 0.2	$ 0.2
Capital leases																					0.7	1.0
Notes payable and other current debt	89.1	89.1	50.1
Long-term debt, excluding current portion	296.4	296.4	299.3
Expiration date of credit facility				Apr. 30, 2017		Jun. 30, 2014
Line of credit facility, maximum capacity				350.0
Credit available for the issuance of letters of credit				30.0
Credit facility is available for swing-line loans				30.0
Line of credit interest rate margin added to Libor at minimum (in hundredths)				1.25%
Line of credit interest rate margin added to Libor at maximum (in hundredths)				2.25%
Line of credit facility, current borrowing capacity				300.0		225.0
Line of credit facility classified as short-term				13.6
Line of credit facility, classified as long-term				191.3
Aggregate principal amount repurchased																	158.4
Interest rate (in hundredths)																	4.00%
Approximately aggregate outstanding principal amount (in hundredth)		98.06%															98.06%
Convertible debt, purchase price per $1000 of debt																	1,038.91
Recognized a loss on debt extinguishment	11.6	11.6
Debt Issuance Cost				1.4		0.8
Purchase Premium Paid Convertible Debt		6.2
Write off of Deferred Debt Issuance Cost		4.4
Payments of Debt Extinguishment Costs		$ 1.0