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BENEFIT PLANS - PENSION BENEFITS AND OTHER POSTRETIREMENT BENEFITS RECOGNIZED IN THE ACCOMPANYING CONSOLIDATED BALANCE SHEETS (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]    
Deferred tax asset $ 39.6 $ 27.5
Total assets 39.6 27.5
Current liabilities (9.1) (8.4)
Other noncurrent liabilities (384.0) (330.3)
Deferred tax liability (0.4) (0.4)
Total liabilities (393.5) (339.1)
Accumulated other comprehensive income 113.2 77.9
Net amount recognized $ (240.7) $ (233.7)