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Stockholders' Equity - Summary of Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Equity [Abstract]    
Foreign currency translation adjustment $ (490.9) $ (488.5)
Pension and postretirement adjustment, net of tax (101.3) (103.4)
Accumulated other comprehensive losses $ (592.2) $ (591.9)