Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified																																																	6 Months Ended
	Jun. 30, 2014 Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Current Assets [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Assets [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Accrued Liabilities [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Other Noncurrent Liabilities [Member]	Jun. 30, 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]	Jun. 30, 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]	Jun. 30, 2014 Assets [Member] Maximum [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 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)																																																	2.00%	2.00%
Assets measured at fair value
Cash and cash equivalents																			$ 54.8	$ 45.3	$ 54.8	$ 45.3	$ 0	$ 0
Foreign exchange contracts - current																									0.1	0	0	0	0.1	0
Commodity hedge contracts - current																									3.1	4.9	0	0	3.1	4.9
Available for sale investments-cash and cash equivalents																															11.6	18.6	11.6	18.6	0	0
Commodity hedge contracts - noncurrent																															0.1	0	0	0	0.1	0
Assets measured at fair value													69.7	68.8	66.4	63.9	3.3	4.9
Liabilities measured at fair value
Foreign exchange contracts																																					0	(0.7)	0	0	0	(0.7)
Commodity hedge contracts - current																																					(25.1)	(0.4)	0	0	(25.1)	(0.4)
Commodity hedge contracts - noncurrent																																											(0.5)	(0.1)	0	0	(0.5)	(0.1)
Liabilities measured at fair value													(25.6)	(1.2)	0	0	(25.6)	(1.2)
Debt Instrument, Fair Value Disclosure	$ (2,163.5)	$ (1,659.9)	$ 0	$ 0	$ (2,163.5)	$ (1,659.9)	$ (1,948.6)	$ (1,507.0)	$ 0	$ 0	$ (1,948.6)	$ (1,507.0)