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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Right-of-Use Assets and Lease Obligations Operating lease assets and obligations included in the accompanying consolidated balance sheet are shown below (in millions):
December 31,20202019
Right-of-use assets under operating leases:
Other long-term assets$540.3 $527.0 
Lease obligations under operating leases:
Accrued liabilities$116.3 $113.9 
Other long-term liabilities438.9 422.4 
$555.2 $536.3 
Maturity of Lease Obligations
Maturities of lease obligations as of December 31, 2020, are shown below (in millions):
2021$141.0 
2022111.5 
202385.9 
202471.5 
202558.7 
Thereafter169.7 
Total undiscounted cash flows638.3 
Less: Imputed interest(83.1)
Lease obligations under operating leases$555.2 
Cash Flow Information, Lease Expense, Weighted Average Lease Term and Discount Rate
Cash flow information related to operating leases is shown below (in millions):
For the year ended December 31,20202019
Non-cash activity:
Right-of-use assets obtained in exchange for operating lease obligations$135.1 $214.3 
Operating cash flows:
Cash paid related to operating lease obligations$143.8 $141.8 
Lease expense included in the accompanying consolidated statement of income is shown below (in millions):
For the year ended December 31,20202019
Operating lease expense$148.6 $140.6 
Short-term lease expense15.4 17.0 
Variable lease expense8.0 6.5 
Total lease expense$172.0 $164.1 
The weighted average lease term and discount rate for operating leases as of December 31, 2020, are shown below:
Weighted average remaining lease term Seven years
Weighted average discount rate3.4 %