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Leases - Summary of Supplemental Information Related to Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Assets And Liabilities Lessee [Abstract]    
Finance leases, right of use assets $ 22.2 $ 13.2
Financing Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other long-term assets Other long-term assets
Finance leases, current lease liabilities $ 6.9 $ 3.6
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities
Finance leases, long-term lease liabilities $ 15.6 $ 9.7
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]] Other long-term liabilities Other long-term liabilities
Finance leases, weighted average remaining lease term 3 years 6 months 4 years
Finance leases, weighted average discount rates 1.90% 2.40%
Operating leases, right of use assets $ 194.7 $ 149.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other long-term assets Other long-term assets
Operating leases, current lease liabilities $ 39.3 $ 43.5
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities
Operating leases, long-term lease liabilities $ 160.8 $ 109.1
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other long-term liabilities Other long-term liabilities
Operating leases, weighted average remaining lease term 8 years 5 years 6 months
Operating leases, weighted average discount rates 2.90% 2.90%
Lease right of use assets, total $ 216.9 $ 162.2
Current lease liabilities, total 46.2 47.1
Long-term lease liabilities, total $ 176.4 $ 118.8