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Income Taxes - Federal, State and Foreign Income Tax Provisions/(Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal:
Current	$ 70.8	$ 30.9	$ 35.9
Deferred	5.4	16.5	2.6
State:
Current	7.0	3.8	4.3
Deferred	(1.3)	4.0	0.9
Foreign:
Current	7.0	2.3	3.9
Deferred	(5.1)	(4.3)	0.0
(Benefit) provision for income taxes	$ 83.8	$ 53.3	$ 47.6

X

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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