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Stockholders' Equity - Summary of Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Foreign currency translation adjustment	$ (572.7)	$ (400.1)
Pension and postretirement adjustment, net of tax	(86.0)	(86.8)
Accumulated other comprehensive losses	$ (658.7)	$ (486.9)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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