Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified																																																	9 Months Ended
	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Maximum [Member] Liability [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Maximum [Member] Assets [Member] Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Benchmark interest rates for contracts (in hundredths)																																																	.015	.035
Assets
Available for sale investments-marketable securities																																					$ 27.4	$ 29.6	$ 27.4	$ 29.6	$ 0	$ 0
Foreign exchange contracts																																											0	1.0	0	0	0	1.0
Commodity hedge contracts																																											0.7	0	0	0	0.7	0
Assets measured at fair value																															28.1	30.6	27.4	29.6	0.7	1.0
Liabilities
Foreign exchange contracts							(0.5)	0	0	0	(0.5)	0
Commodity hedge contracts							(10.1)	(21.6)	0	0	(10.1)	(21.6)	(0.2)	0	0	0	(0.2)	0
Liabilities measured at fair value	(10.8)	(21.6)	0	0	(10.8)	(21.6)
Debt Instrument, Fair Value Disclosure																			$ (1,278.0)	$ (887.8)	$ 0	$ 0	$ (1,278.0)	$ (887.8)	$ (1,392.2)	$ (900.7)	$ 0	$ 0	$ (1,392.2)	$ (900.7)