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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance as of January 1	$ 62.7	$ 49.4
Additions based on tax positions related to the current year	1.4	8.3
Settlements with taxing authorities	(10.2)	0.0
Balance as of December 31	78.2	$ 62.7
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	$ 32.0

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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 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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