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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
VALUATION AND QUALIFYING ACCOUNTS VALUATION AND QUALIFYING ACCOUNTS
  Additions  
 Balance at
Beginning
of Period		Charged to
Costs and
Expenses		Charged to
Other
Accounts		DeductionsBalance at
End of
Period
 (in millions)
Year ended December 31, 2020     
Allowance for doubtful accounts (a)$14.7 $3.1 $— $(1.4)$16.4 
Tax valuation allowance (b)64.0 6.3 0.6 (1.1)69.8 
Year ended December 31, 2019     
Allowance for doubtful accounts (a)$13.6 $4.7 $0.2 $(3.8)$14.7 
Tax valuation allowance (b)44.9 18.9 0.2 — 64.0 
Year ended December 31, 2018     
Allowance for doubtful accounts (a)$13.7 $2.2 $1.0 $(3.3)$13.6 
Tax valuation allowance (b)41.6 7.1 (1.8)(2.0)44.9 
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(a)    The deductions related to allowances for doubtful accounts represent accounts receivable which are written off.

(b)     The tax valuation allowances are provided for other-than-temporary impairments and unrealized losses related to certain investments that may not be recognized due to the uncertainty of the ready marketability of certain impaired investments, and net operating loss and credit carryforwards that may not be recognized due to insufficient taxable income.