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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule of inventory
Inventories are stated at the lower of cost and net realizable value, determined by the first-in, first-out method, and consist of the following:
 
September 30,
 
December 31,
(in millions)
2018
 
2017
Finished goods
$
144.0

 
$
119.6

Work-in-process
12.1

 
11.3

Raw materials and supplies
64.4

 
48.2

 
$
220.5

 
$
179.1

Changes in accrued sales returns
The Company had the following activity for sales returns from December 31, 2017 to September 30, 2018:
(in millions)
 
Balance as of December 31, 2017
$
30.0

Reclassification and remeasurement of sales return asset under Topic 606
1.7

Balance as of January 1, 2018
31.7

Amounts accrued
72.5

Returns charged to accrual
(68.4
)
Balance as of September 30, 2018
$
35.8

Warranty activity
The Company had the following activity for its accrued warranty expense from December 31, 2017 to September 30, 2018:
(in millions)
 
Balance as of December 31, 2017
$
36.7

Remeasurement of obligations under Topic 606
2.8

Balance as of January 1, 2018
39.5

Amounts accrued
29.0

Warranties charged to accrual
(31.8
)
Balance as of September 30, 2018
$
36.7