Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Estimate of Fair Value Measurement [Member] \| Long-term Debt [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	(2,478.3)	$ (1,659.9)
Estimate of Fair Value Measurement [Member] \| Long-term Debt [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	0	0
Estimate of Fair Value Measurement [Member] \| Long-term Debt [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	(2,478.3)	(1,659.9)
Reported Value Measurement [Member] \| Long-term Debt [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	(2,452.5)	(1,507.0)
Reported Value Measurement [Member] \| Long-term Debt [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	0	0
Reported Value Measurement [Member] \| Long-term Debt [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	(2,452.5)	(1,507.0)
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value
Assets measured at fair value	80.1	68.8
Liabilities measured at fair value
Liabilities measured at fair value	(41.9)	(1.2)
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Assets measured at fair value	73.5	63.9
Liabilities measured at fair value
Liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Assets measured at fair value	6.6	4.9
Liabilities measured at fair value
Liabilities measured at fair value	(41.9)	(1.2)
Fair Value, Measurements, Recurring [Member] \| Cash and Cash Equivalents [Member]
Assets measured at fair value
Cash and cash equivalents	70.2	45.3
Fair Value, Measurements, Recurring [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Cash and cash equivalents	70.2	45.3
Fair Value, Measurements, Recurring [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Cash and cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Assets [Member]
Assets measured at fair value
Available for sale investments-cash and cash equivalents	3.3	18.6
Commodity hedge contracts-noncurrent	1.8	0
Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Available for sale investments-cash and cash equivalents	3.3	18.6
Commodity hedge contracts-noncurrent	0	0
Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Available for sale investments-cash and cash equivalents	0	0
Commodity hedge contracts-noncurrent	1.8	0
Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member]
Liabilities measured at fair value
Foreign exchange contracts	0	(0.7)
Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Foreign exchange contracts	0	0
Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Foreign exchange contracts	0	(0.7)
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Current Assets [Member]
Assets measured at fair value
Foreign exchange contracts	1.2	0
Commodity hedge contracts-current	3.6	4.9
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Foreign exchange contracts	0	0
Commodity hedge contracts-current	0	0
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Foreign exchange contracts	1.2	0
Commodity hedge contracts-current	3.6	4.9
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts-current	(36.2)	(0.4)
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts-current	0	0
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts-current	(36.2)	(0.4)
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Liabilities [Member]
Liabilities measured at fair value
Commodity hedge contracts-noncurrent	(5.7)	(0.1)
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Commodity hedge contracts-noncurrent	0	0
Commodity Contract [Member] \| Fair Value, Measurements, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Commodity hedge contracts-noncurrent	(5.7)	$ (0.1)
Assets [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%
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)	3.00%

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Risk that one party to the contract will default expressed as a percentage, used as an input to measure fair value.

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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No definition available.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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No definition available.

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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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No definition available.

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