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Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of unrecognized tax benefits      
Balance at beginning of year $ 89.5 $ 59.0 $ 32.8
Additions from the Valspar acquisition 12.4 18.9
Additions based on tax positions related to the current year 14.9 12.9 6.8
Additions for tax positions of prior years 107.9 11.0 4.0
Reductions for tax positions of prior years (3.6) (2.0) (1.2)
Settlements (1.4) (0.3)
Lapses of statutes of limitations (5.7) (2.4) (2.0)
Balance at end of year $ 203.0 $ 89.5 $ 59.0