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Leases and commitments - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Leases      
Operating lease right-of-use assets $ 62.7 $ 79.3 $ 71.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other accrued liabilities Other accrued liabilities  
Other accrued liabilities $ 35.4 $ 37.1  
Long-term operating lease liabilities 46.1 62.4  
Total operating lease liabilities $ 81.5 $ 99.5  
Finance Leases      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Outsourcing assets, net Outsourcing assets, net  
Outsourcing assets, net $ 1.2 $ 2.9  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current maturities of long-term debt Current maturities of long-term debt  
Current maturities of long-term debt $ 1.6 $ 2.4  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term debt Long-term debt  
Long-term debt $ 1.1 $ 3.1  
Total finance lease liabilities $ 2.7 $ 5.5  
Weighted-Average Remaining Lease Term (in years)      
Operating leases 2 years 8 months 12 days 2 years 3 months 18 days  
Finance leases 1 year 2 months 12 days 2 years  
Weighted-Average Discount Rate      
Operating leases (as a percentage) 6.10% 6.40%  
Finance Leases (as a percentage) 5.50% 5.20%