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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance as of January 1	$ 37.6	$ 28.3
Additions based on tax positions related to the current year	8.0	10.8
Unrecognized Tax Benefits, Increase Resulting from Acquisition	3.8
Increase/(Decrease) related to tax positions of prior years		(1.5)
Lapse of statute of limitations	0.0	0.0
Balance as of December 31	49.4	$ 37.6
Conclusion of Examination by Tax Authorities [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Gross unrecognized tax benefits where settlement in next twelve months is reasonably possible	$ 2.0

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- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Amount of unrecognized tax benefits.

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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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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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