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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Components of Lease Cost The components of lease cost follow:
(in millions)20202019
Operating lease cost$26.8 $24.9 
Variable lease cost2.7 3.7 
Short-term lease cost3.9 2.7 
Total lease cost$33.4 $31.3 
Summary of Lease Assets and Lease Liabilities
A summary of lease assets and liabilities follows:
(in millions)
December 31,
2020		December 31,
2019
Assets:
Operating lease right-of-use assets(1)
$68.3 $74.9 
Liabilities:
Operating lease liabilities - current(2)
21.5 20.9 
Operating lease liabilities - long-term(3)
53.1 59.7 
Total lease liabilities$74.6 $80.6 
(1)Included in other long-term assets.
(2)Included in accrued and other current liabilities.
(3)Included in other long-term liabilities.
Maturity of Lease Liabilities
Maturity of lease liabilities as of December 31, 2020, follow:
(in millions)
20212022202320242025ThereafterTotal
Lease payments$23.4 $17.5 $11.7 $7.9 $4.7 $18.9 $84.1 
Less: imputed interest(9.5)
Total lease liabilities$74.6 
Lease Term and Discount Rate
Lease Term and Discount Rate
December 31,
2020		December 31,
2019
Operating leases:
Weighted-average remaining lease term (in years)5.96.3
Weighted-average discount rate3.3 %3.4 %