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Income Taxes Refundable Income Taxes and Income Taxes Payable (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Refundable income taxes and income taxes payable [Line Items]
Decrease in prior year tax positions	$ 0.4	$ 2.5	$ 9.4
Refundable income taxes	30.0
Prepaid Expenses and Other Current Assets [Member]
Refundable income taxes and income taxes payable [Line Items]
Refundable income taxes	9.6	3.4
Other Assets and Deferred Charges [Domain]
Refundable income taxes and income taxes payable [Line Items]
Refundable income taxes	20.4
Accrued Liabilities [Member]
Refundable income taxes and income taxes payable [Line Items]
Taxes Payable, Current	$ 11.6	$ 0.9
Tax positions relating to transfer pricing [Member]
Refundable income taxes and income taxes payable [Line Items]
Decrease in prior year tax positions			$ 11.5

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[Line Items] for Refundable income taxes and income taxes payable [Table]

+ References

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.5(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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