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Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Future Payments Under Operating Lease Arrangements Future payments under operating lease arrangements as of September 30, 2020 are as follows (in millions):
2020 (remaining)$9.3 
202136.9 
202229.6 
202325.7 
202417.1 
Thereafter87.2 
Total lease payments, undiscounted$205.8 
Less: discount55.8 
Total operating lease liability as of September 30, 2020, at present value
$150.0 
Less: operating lease liability as of September 30, 2020, current
26.7 
Operating lease liability as of September 30, 2020, long term
$123.3