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Income Taxes - Provision (Benefit) For Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 1.2	$ (2.0)	$ 26.3
State and local	0.0	(2.2)	0.2
Foreign	48.5	55.3	53.1
Current, Provision (benefit) for income taxes	49.7	51.1	79.6
Deferred:
Federal	(5.0)	99.4	(356.3)
State and local	0.0	0.0	0.4
Foreign	18.0	(25.4)	10.8
Deferred, Provision (benefit) for income taxes	13.0	74.0	(345.1)
Total provision (benefit)	$ 62.7	$ 125.1	$ (265.5)

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