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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Movement in Extended Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 31.3 $ 26.1
Amounts accrued 28.8 34.2
Warranties charged to accrual (30.5) (29.0)
Balance at end of period $ 29.6 $ 31.3