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Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Schedule of Total Lease Costs (Net)
The Company and its Affiliates currently lease office space and equipment under various operating leasing arrangements. For the year ended December 31, 2018, consolidated lease costs were $40.5 million. The following table presents total lease costs (net) for 2019 and 2020:
For the Years Ended December 31,
20192020
Operating lease costs$41.7 $37.6 
Short-term lease costs2.1 0.8 
Variable lease costs0.1 0.0 
Sublease income(4.4)(5.0)
Total lease costs (net)$39.5 $33.4 
Schedule of the Company's Maturity of Lease Liabilities As of December 31, 2020, the maturities of lease liabilities were as follows:
YearOperating Leases
2021$40.5 
202236.7 
202332.0 
202425.9 
202521.3 
Thereafter59.6 
Total undiscounted lease liabilities(1)
$216.0 
__________________________(1)Total undiscounted lease liabilities were $34.9 million greater than the operating leases recorded in Other liabilities primarily due to present value discounting. Both amounts exclude leases with initial terms of 12 months or less and leases that have not yet commenced.