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Income Taxes - Components of Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income taxes:
U.S. federal	$ (9.2)	$ 53.2	$ 14.3
U.S. state	0.8	0.6	0.1
Foreign	11.6	14.2	17.2
Current income taxes	3.2	68.0	31.6
Deferred income taxes:
U.S. federal	3.6	(1.3)	(2.7)
U.S. state	1.4	2.9	(4.0)
Foreign	2.5	0.0	(9.5)
Deferred income taxes	7.5	1.6	(16.2)
Provision for income taxes	$ 10.7	$ 69.6	$ 15.4

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