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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 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:
 
June 30,
 
December 31,
(in millions)
2019
 
2018
Finished goods
$
143.4

 
$
148.9

Work-in-process
11.0

 
11.8

Raw materials and supplies
88.7

 
61.6

 
$
243.1

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

Amounts accrued
52.0

Returns charged to accrual
(49.4
)
Balance as of June 30, 2019
$
36.9
Warranty activity
The Company had the following activity for its accrued warranty expense from December 31, 2018 to June 30, 2019:
(in millions)
 
Balance as of December 31, 2018
$
36.4

Amounts accrued
14.3

Warranties charged to accrual
(13.1
)
Balance as of June 30, 2019
$
37.6