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Income Taxes - Activity for Unrecognized Gross Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized Gross Tax Benefits
Balance at beginning of year	$ 112.2	$ 114.8	$ 136.7
Acquired balances	15.5	0.0	0.0
Additions for tax benefits related to the current year	9.4	7.4	23.6
Additions for tax benefits of prior years	8.0	2.8	4.7
Reductions for tax benefits of prior years	(0.2)	(1.9)	(1.6)
Lapse of statute	(8.2)	(10.9)	(16.3)
Settlements	(6.7)	0.0	(4.9)
Change in rate due to U.S. Tax Reform	0.0	0.0	(27.4)
Balance at end of year	$ 130.0	$ 112.2	$ 114.8

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- Definition

Unrecognized Tax Benefits, Reduction Resulting From Change In Tax Rate

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Amount of unrecognized tax benefits.

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