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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Components of Lease Expense and Supplemental Cash Flow Information
The components of lease expense were as follows (in millions):
Year Ended December 31,
202120202019
Operating lease expense$26.5 $18.5 $15.3 
Variable lease expense (1)
3.1 2.3 2.6 
Short-term lease expense3.7 3.8 3.2 
Total lease expense$33.3 $24.6 $21.1 
(1) Variable lease expense for the year ended December 31, 2021, 2020 and 2019 predominantly included common area maintenance charges and parking expense.
Supplemental cash flow information related to leases was as follows (in millions):
 Year Ended December 31,
 202120202019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows used for operating leases$25.8 $18.9 $16.2 
Supplemental Balance Sheet Information
Supplemental balance sheet information related to our operating leases was as follows (in millions, except lease term and discount rate):
 ClassificationDecember 31,
2021		December 31,
2020
Operating lease ROU assets – non-currentOther assets$65.1 $49.3 
Operating lease liabilities – currentAccrued liabilities$26.3 $19.1 
Operating lease liabilities – non-currentOther liabilities40.5 34.0 
Total operating lease liabilities$66.8 $53.1 
Weighted average remaining lease term in years – operating leases3.03.5
Weighted average discount rate – operating leases2.1 %3.2 %
Maturities of Operating Lease Liabilities
Maturities of operating lease liabilities as of December 31, 2021 were as follows (in millions):
Year Ending December 31,Amount
2022$27.3 
202320.5 
202414.0 
20255.1 
20261.6 
Thereafter0.4 
Total lease payments$68.9 
Less imputed interest(2.1)
Total$66.8