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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income tax payments		$ 23.4	$ 43.0	$ 27.5
Statutory corporate tax rate		35.00%	35.00%	35.00%
Net deferred tax liabilities		$ 0.5
Minimum [Member]
Statutory corporate tax rate		21.00%
Maximum [Member]
Statutory corporate tax rate		35.00%
Subsequent Event [Member]
Estimated effective tax rate	24.50%
Scenario Previously Reported [Member]
Impact on current deferred tax assets			$ 8.8
Impact on noncurrent deferred tax liabilities			$ 8.5

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- Definition

The future estimated effective tax rate as a result of federally mandated changes.

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The impact on current deferred tax assets per the accounting standards update.

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The impact on noncurrent deferred tax liabilities per the accounting standards update.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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