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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2019
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)
2019
 
2018
Finished goods
$
165.5

 
$
148.9

Work-in-process
11.5

 
11.8

Raw materials and supplies
93.8

 
61.6

 
$
270.8

 
$
222.3
Changes in accrued sales returns
The Company had the following activity for sales returns from December 31, 2018 to September 30, 2019:
(in millions)
 
Balance as of December 31, 2018
$
34.3

Amounts accrued
81.5

Returns charged to accrual
(76.0
)
Balance as of September 30, 2019
$
39.8
Warranty activity
The Company had the following activity for its accrued warranty expense from December 31, 2018 to September 30, 2019:
(in millions)
 
Balance as of December 31, 2018
$
36.4

Amounts accrued
23.6

Warranties charged to accrual
(18.8
)
Balance as of September 30, 2019
$
41.2