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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward] |  |
Beginning balance | $ 39.5 |
Reclassification and remeasurement of sales return asset under Topic 606 |  | $ 2.8
Amounts accrued | 19.1 |
Warranties charged to accrual | (21.4) |
Ending balance | 37.2 |
Previously Reported |  |
Movement in Standard Product Warranty Accrual [Roll Forward] |  |
Beginning balance | $ 36.7 |

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