Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified																																																	3 Months Ended
	Mar. 31, 2014 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Mar. 31, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Mar. 31, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Assets [Member] Maximum [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Liability [Member] Maximum [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)																																																	1.00%	1.00%
Assets measured at fair value
Cash and cash equivalents																			$ 31.1	$ 45.3	$ 31.1	$ 45.3	$ 0	$ 0
Commodity hedge contracts - current																									4.8	4.9	0	0	4.8	4.9
Available for sale investments-marketable securities																															11.6	18.6	11.6	18.6	0	0
Assets measured at fair value													47.5	68.8	42.7	63.9	4.8	4.9
Liabilities measured at fair value
Foreign exchange contracts																																					(0.1)	(0.7)	0	0	(0.1)	(0.7)
Commodity hedge contracts - current																																					(3.5)	(0.4)	0	0	(3.5)	(0.4)
Commodity hedge contracts - noncurrent																																											(0.2)	(0.1)	0	0	(0.2)	(0.1)
Liabilities measured at fair value													(3.8)	(1.2)	0	0	(3.8)	(1.2)
Debt Instrument, Fair Value Disclosure	$ (1,819.5)	$ (1,659.9)	$ 0	$ 0	$ (1,819.5)	$ (1,659.9)	$ (1,657.8)	$ (1,507.0)	$ 0	$ 0	$ (1,657.8)	$ (1,507.0)