Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified																																																	3 Months Ended
	Mar. 31, 2013 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2012 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Mar. 31, 2013 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Liability [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2012 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2013 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Liability [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Liability [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2013 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Assets [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2013 Maximum [Member] Liability [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)																																																	.004
Assets
Cash and cash equivalents																															$ 191.8	$ 227.0	$ 191.8	$ 227.0	$ 0	$ 0
Available for sale investments-marketable securities																																					26.4	26.3	26.4	26.3	0	0
Foreign exchange contracts																																											0.3	0	0	0	0.3	0
Commodity hedge contracts																																											16.3	25.5	0	0	16.3	25.5
Assets measured at fair value																									234.8	278.8	218.2	253.3	16.6	25.5
Liabilities
Foreign exchange contracts																			0	(0.2)	0	0	0	(0.2)
Commodity hedge contracts																			(0.1)	(1.3)	0	0	(0.1)	(1.3)
Liabilities measured at fair value													(0.1)	(1.5)	0	0	(0.1)	(1.5)
Debt Instrument, Fair Value Disclosure	$ (1,387.5)	$ (1,379.3)	$ 0	$ 0	$ (1,387.5)	$ (1,379.3)	$ (1,412.6)	$ (1,411.9)	$ 0	$ 0	$ (1,412.6)	$ (1,411.9)