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Summary of Significant Accounting Policies - Changes in Accrued Sales Returns (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Changes in Accrued Sales Returns [Roll Forward] |  |
Beginning balance | $ 30.3 | $ 28.5
Amounts accrued | 102.1 | 130.6
Returns charged to accrual | (102.4) | (128.8)
Ending balance | 30.0 | 30.3
Accrued Liabilities, Current |  |
Changes in Accrued Sales Returns [Roll Forward] |  |
Beginning balance | 20.0 |
Ending balance | 19.6 | 20.0
Other Noncurrent Liabilities |  |
Changes in Accrued Sales Returns [Roll Forward] |  |
Beginning balance | 10.3 |
Ending balance | $ 10.4 | $ 10.3

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- Definition Changes in Accrued Sales Returns [Roll Forward] + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date for estimated product return rights granted to customers. + References No definition available. + Details
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- Definition Increase in the accrual for estimated sales returns. + References No definition available. + Details
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- Definition Reduction in the accrual for returns charged to sales. The aggregate refunds recognized during an accounting period due to goods returned. + References No definition available. + Details
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- Details
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