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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating Lease, Cost $ 15.9 $ 15.0
Finance Lease, Right-of-Use Asset, Amortization 1.8 1.7
Finance Lease, Interest Expense 1.8 1.9
Variable Lease, Cost 1.6 1.2
Lease, Cost 21.0 19.8
Operating Lease, Payments 17.9 16.6
Finance Lease, Interest Payment on Liability 1.8 1.9
Finance Lease, Principal Payments 1.6 1.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 4.4 2.5
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0.3 0.5
Operating lease right-of-use assets 63.5 73.1
Finance Lease, Right-of-Use Asset, before Accumulated Amortization 26.7 26.5
Finance Lease, Right-of-Use Asset, Accumulated Amortization (12.7) (11.1)
Total leased assets 77.5 88.5
Finance Lease, Liability, Current 1.7 1.4
lease liabilities, current 17.0 15.3
Long-term operating lease liabilities 54.3 65.6
Finance Lease, Liability, Noncurrent 19.1 20.6
Lease Liabilities, non-current 73.4 86.2
Operating Lease, Liability 69.5 79.5
Finance Lease, Liability 20.8 22.0
Lease Liability $ 90.3 $ 101.5
Operating Lease, Weighted Average Remaining Lease Term 5 years 9 months 18 days 6 years 7 months 6 days
Finance Lease, Weighted Average Remaining Lease Term 9 years 9 months 18 days 10 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent 4.90% 4.90%
Finance Lease, Weighted Average Discount Rate, Percent 8.40% 8.30%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 18.2  
Finance Lease, Liability, Payments, Due Next Twelve Months 3.4  
Lessee, Operating Lease, Liability, Payments, Due Year Two 17.3  
Finance Lease, Liability, Payments, Due Year Two 3.2  
Lessee, Operating Lease, Liability, Payments, Due Year Three 10.4  
Finance Lease, Liability, Payments, Due Year Three 2.9  
Lessee, Operating Lease, Liability, Payments, Due Year Four 7.5  
Finance Lease, Liability, Payments, Due Year Four 2.8  
Lessee, Operating Lease, Liability, Payments, Due Year Five 7.2  
Finance Lease, Liability, Payments, Due Year Five 2.8  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 19.5  
Finance Lease, Liability, Payments, Due after Year Five 15.9  
Lessee, Operating Lease, Liability, Payments, Due 80.2  
Finance Lease, Liability, Payment, Due 30.9  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (10.7)  
Finance Lease, Liability, Undiscounted Excess Amount $ (10.1)  
Maximum [Member]    
Lessee, Lease, Description [Line Items]    
Remaining lease term 11 years  
Minimum [Member]    
Lessee, Lease, Description [Line Items]    
Remaining lease term 1 year  
Accrued Liabilities    
Lessee, Lease, Description [Line Items]    
Operating Lease, Liability, Current $ 15.3 $ 13.9
Finance lease costs [Member]    
Lessee, Lease, Description [Line Items]    
Lease, Cost $ 3.5 $ 3.6