Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Debt Instrument [Line Items]
Revolving credit facility draw down amount without violating covenant	$ 820.0		$ 820.0
interest coverage ratio numerator actual	5.5		5.5
interest coverage ratio denominator actual	1		1
Goodwill, Impairment Loss	44.0	0	44.0	0
Impact of noncash China impairment on interest coverage ratio	0.40%		0.40%
Other debt instrument that could cross-default	1,700.0		1,700.0
Goodwill and Intangible Asset Impairment					263.0
Debt Instrument, Interest Rate Increase	1.50%		1.50%
Commercial Paper Program	1,000.0		1,000.0
Commercial Paper	68.9		68.9
Incremental impairment charge to add back to interest coverage ratio			125.0
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,000.0		1,000.0
Minimum Compliance Of Interest Coverage Ratio Numerator	4		4
Minimum Compliance Interest Coverage Ratio Denominator	1		1
Private Placement [Member]
Debt Instrument [Line Items]
Private Placement Notes	535.0		535.0
Minimum Compliance Of Interest Coverage Ratio Numerator	4		4
Minimum Compliance Interest Coverage Ratio Denominator	1		1
Maximum leverage ratio numerator March 2013	4		4
Maximum leverage ratio denominator March 2013	1		1
Maximum leverage ratio numerator March 2014	3.75		3.75
Maximum leverage ratio denominator March 2014	1		1
Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500.0		500.0
Term loan incremental draw down	50.0		50.0
Minimum Compliance Of Interest Coverage Ratio Numerator	4		4
Minimum Compliance Interest Coverage Ratio Denominator	1		1
Long-term Line of Credit, Noncurrent	550.0		550.0
Maximum leverage ratio numerator March 2013	4		4
Maximum leverage ratio denominator March 2013	1		1
Maximum leverage ratio numerator Dec 2013	3.75		3.75
Maximum leverage ratio denominator Dec 2013	1		1
Maximum leverage ratio numerator March 2014	3.5		3.5
Maximum leverage ratio denominator March 2014	1		1
China [Member]
Debt Instrument [Line Items]
Goodwill, Impairment Loss	$ 44.0