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Leases (Lease Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lease Maturity [Line Items]    
Total Future Minimum Lease Payments Due, Next Twelve Months $ 44.4  
Total Future Minimum Lease Payments, Due in Two Years 37.4  
Total Future Minimum Lease Payments, Due in Three Years 33.5  
Total Future Minimum Lease Payments, Due in Four Years 25.3  
Total Future Minimum Lease Payments, Due in Five Years 19.8  
Total Future Minimum Lease Payments, Due Thereafter 152.3  
Total Future Minimum Lease Payments Due 312.7  
Undiscounted Excess Amount (77.5)  
Total Lease Liability 235.2 $ 266.3
Short-term Lease Liability 33.6  
Long-term Lease Liability 201.6  
Finance Leases, Future Minimum Payments Due, Next Twelve Months 32.7  
Finance Leases, Future Minimum Payments Due in Two Years 32.2  
Finance Leases, Future Minimum Payments Due in Three Years 28.8  
Finance Leases, Future Minimum Payments Due in Four Years 20.8  
Finance Leases, Future Minimum Payments Due in Five Years 16.1  
Finance Leases, Future Minimum Payments Due Thereafter 134.1  
Finance Lease, Liability, Payment, Due 264.7  
Finance Lease, Liability, Current 23.3 13.4
Finance Lease, Liability, Noncurrent 171.7 188.1
Operating Leases, Future Minimum Payments Due, Next Twelve Months 11.7  
Operating Leases, Future Minimum Payments, Due in Two Years 5.2  
Operating Leases, Future Minimum Payments, Due in Three Years 4.7  
Operating Leases, Future Minimum Payments, Due in Four Years 4.5  
Operating Leases, Future Minimum Payments, Due in Five Years 3.7  
Operating Leases, Future Minimum Payments, Due Thereafter 18.2  
Lessee, Operating Lease, Liability, Payments, Due 48.0  
Operating Lease, Liability, Current 10.3 13.2
Operating Lease, Liability, Noncurrent 29.9 $ 51.6
Finance Lease    
Lease Maturity [Line Items]    
Finance Leases, Future Minimum Payments Due, Next Twelve Months 32.7  
Finance Leases, Future Minimum Payments Due in Two Years 32.2  
Finance Leases, Future Minimum Payments Due in Three Years 28.8  
Finance Leases, Future Minimum Payments Due in Four Years 20.8  
Finance Leases, Future Minimum Payments Due in Five Years 16.1  
Finance Leases, Future Minimum Payments Due Thereafter 134.1  
Finance Lease, Liability, Payment, Due 264.7  
Finance Lease, Liability, Undiscounted Excess Amount (69.7)  
Finance Lease, Liability 195.0  
Finance Lease, Liability, Current 23.3  
Finance Lease, Liability, Noncurrent 171.7  
Operating Lease    
Lease Maturity [Line Items]    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 11.7  
Operating Leases, Future Minimum Payments, Due in Two Years 5.2  
Operating Leases, Future Minimum Payments, Due in Three Years 4.7  
Operating Leases, Future Minimum Payments, Due in Four Years 4.5  
Operating Leases, Future Minimum Payments, Due in Five Years 3.7  
Operating Leases, Future Minimum Payments, Due Thereafter 18.2  
Lessee, Operating Lease, Liability, Payments, Due 48.0  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (7.8)  
Operating Lease, Liability 40.2  
Operating Lease, Liability, Current 10.3  
Operating Lease, Liability, Noncurrent $ 29.9