Fair Value Measurements (Details) $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Estimate of Fair Value Measurement [Member] \| Long-term Debt [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	$ (2,023.5)	$ (1,852.4)
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	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	(2,023.5)	(1,852.4)
Reported Value Measurement [Member] \| Long-term Debt [Member]
Liabilities measured at fair value
Long-term debt, including current maturities	(1,968.8)	(1,993.7)
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	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	(1,968.8)	(1,993.7)
Fair Value, Recurring [Member]
Assets measured at fair value
Assets measured at fair value	46.7	65.0
Liabilities measured at fair value
Liabilities measured at fair value	(19.1)	(10.2)
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Assets measured at fair value	31.0	48.6
Liabilities measured at fair value
Liabilities measured at fair value	0.0	0.0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Assets measured at fair value	15.7	16.4
Liabilities measured at fair value
Liabilities measured at fair value	(19.1)	(10.2)
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member]
Assets measured at fair value
Cash and cash equivalents	31.0	48.6
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Cash and cash equivalents	31.0	48.6
Fair Value, Recurring [Member] \| Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Cash and cash equivalents	0.0	0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member]
Assets measured at fair value
Derivative assets, current	0.0	0.1
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Derivative assets, current	0.0	0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Derivative assets, current	0.0	0.1
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	0.1	0.4
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	0.0	0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	0.1	0.4
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member]
Liabilities measured at fair value
Derivative liabilities, current	(0.5)	(1.2)
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Derivative liabilities, current	0.0	0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Derivative liabilities, current	(0.5)	(1.2)
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	(0.2)	(1.5)
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	0.0	0.0
Foreign Exchange Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	(0.2)	(1.5)
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member]
Assets measured at fair value
Derivative assets, current	12.9	13.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Derivative assets, current	0.0	0.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Current Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Derivative assets, current	12.9	13.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	2.7	2.9
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	0.0	0.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Assets [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets measured at fair value
Derivative Asset, Noncurrent	2.7	2.9
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member]
Liabilities measured at fair value
Derivative liabilities, current	(16.5)	(5.9)
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Derivative liabilities, current	0.0	0.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Accrued Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Derivative liabilities, current	(16.5)	(5.9)
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	(1.9)	(1.6)
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 1 [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	0.0	0.0
Commodity Contract [Member] \| Fair Value, Recurring [Member] \| Other Noncurrent Liabilities [Member] \| Fair Value, Inputs, Level 2 [Member]
Liabilities measured at fair value
Derivative liabilities, noncurrent	$ (1.9)	$ (1.6)
Measurement Input, Counterparty Credit Risk [Member] \| 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 liability contracts (in hundredths)	0.040
Measurement Input, Counterparty Credit Risk [Member] \| 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 asset contracts (in hundredths)	0.014

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value of financial and nonfinancial obligations.

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