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Operations and Summary of Significant Accounting Policies - Warranty Reserves (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty reserves, beginning of period $ 392.8 $ 360.9 $ 316.0
Acquisitions 0.2 0.0 0.0
Accruals for warranties issued during the year 310.2 234.1 230.5
Settlements made (in cash or in kind) during the year (204.3) (198.7) (174.7)
Foreign currency translation 22.9 (3.5) (10.9)
Warranty reserves, end of period $ 521.8 $ 392.8 $ 360.9