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Leases and commitments - Supplemental Balance Sheet Information (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leases
Operating lease right-of-use assets	$ 127.1
Other accrued liabilities	70.0
Long-term operating lease liabilities	83.6
Total operating lease liabilities	153.6
Finance Leases
Outsourcing assets, net	4.6
Current maturities of long-term debt	1.8
Long-term debt	3.5
Total finance lease liabilities	$ 5.3
Weighted-Average Remaining Lease Term (in years)
Operating leases	3 years 1 month 6 days
Finance leases	3 years
Weighted-Average Discount Rate
Operating leases	6.30%
Finance leases	5.00%

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