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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance as of January 1	$ 49.4	$ 37.6
Additions based on tax positions related to the current year	8.3	8.0
Unrecognized Tax Benefits, Increase Resulting from Acquisition	5.0
Increase/(Decrease) related to tax positions of prior years		(3.8)
Lapse of statute of limitations	0.0	0.0
Balance as of December 31	62.7	$ 49.4
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	$ 23.4

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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.

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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 tax positions that have been or will be taken in current period tax return.

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

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