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16. Leases (Notes)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Leases of Lessee Disclosure [Text Block]
16.    LEASES

For our accounting policies on leases, including leases where we act as lessor in reagent rental agreements, see Note 1. We have operating leases and to a lesser extent finance leases, for buildings, vehicles and equipment. Our leases have remaining lease terms of 1 year to 18 years, which includes our determination to exercise renewal options.

The components of lease expense were as follows (in millions):
Twelve Months Ended December 31,20202019
Operating lease cost$45.4 $51.4 
Finance lease cost:
  Amortization of right-to-use assets$0.6$0.6 
  Interest on lease liabilities$0.80.9 
        Total finance lease cost$1.4 $1.5 
Sublease income$3.0 $3.0 
The sublease is for a building with a term that ends in 2025, with no options to extend or renew.

Operating lease cost includes original reduction in the carrying amount of right-of-use assets, the impact of remeasurements, modifications, impairments and abandonments.

Our short-term leases are expensed as incurred, reflecting leases with a lease term of one year or less, and are not significant for the years ended December 31, 2020 and 2019. Operating lease variable cost is primarily comprised of reimbursed actual common area maintenance, property taxes and insurance, which are immaterial for the years ended December 31, 2020 and 2019.

Supplemental cash flow information related to leases was as follows (in millions):
Twelve Months Ended December 31,20202019
Cash paid for amounts included in the measurement of lease liabilities:
  Operating cash flows from operating leases$44.4 $47.2 
  Operating cash flows from finance leases$0.6 $0.9 
  Financing cash flows from finance leases$0.8 $0.6 
Right-of-use assets obtained in exchange for lease obligations:
  Operating leases$16.1 $28.7 
  Finance leases$0.4 $0.2 

Supplemental balance sheet information related to leases was as follows (in millions):
December 31, 20202019
Operating Leases
  Operating lease right-of-use assets$202.1 $201.9 
  Current operating lease liabilities$36.5 $35.4 
  Operating lease liabilities175.1 176.0 
     Total operating lease liabilities$211.6 $211.4 
Finance leases are included in Property, plant and equipment, Current maturities of long-term debt, and Long-term debt, net of current maturities.
December 31,20202019
Finance Leases
  Property, plant and equipment, gross$12.2 $11.4 
  Less: accumulated depreciation and amortization(5.0)(4.2)
      Property, plant and equipment, net$7.2 $7.2 
  Current maturities of long-term debt and notes payable$0.5 $0.5 
  Long-term debt, net of current maturities11.0 11.2 
      Total finance lease liabilities$11.5 $11.7 
December 31, 20202019
Weighted Average Remaining Lease Term
  Operating leases - in years89
  Finance leases - in years1618
Weighted Average Discount Rate
  Operating leases3.9 %4.2 %
  Finance leases6.2 %6.5 %



Maturities of lease liabilities were as follows (in millions):
Year Ending December 31,

Operating LeasesFinance Leases
2021$43.6 $1.3 
202236.5 1.2 
202331.9 1.2 
202427.2 1.2 
202523.2 1.1 
Thereafter90.5 14.0 
   Total lease payments252.9 20.0 
Less imputed interest(41.3)(8.5)
    Total$211.6 $11.5 

The value of our operating lease portfolio is principally for facilities with longer durations than the lesser value vehicles and other equipment with shorter terms and higher-turn over.

As of December 31, 2020, operating leases that have not commenced are not material.

Operating Leases Under ASC 840, Leases

Rents and Leases

Rental expense under operating leases was $47.4 million in 2018.  Leases were principally for facilities and automobiles.