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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Movement in Extended Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 36.7 $ 29.9  
Amounts accrued 21.9 34.5  
Warranties charged to accrual (25.0) (27.7)  
Remeasurement of obligations under Topic 606     $ 2.8
Balance at end of period 36.4 36.7  
Correction      
Movement in Extended Product Warranty Accrual [Roll Forward]      
Balance at beginning of period $ 39.5    
Balance at end of period   $ 39.5