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Leases (Maturities of Operating and Financing Lease Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Operating leases    
2020 $ 126.6 $ 123.9
2021 98.1  
2022 81.0  
2023 68.5  
2024 56.7  
Thereafter 203.6  
Total payments 634.5  
Less: present value discount (89.4)  
Present value of lease payments 545.1  
Current portion 111.7  
Noncurrent portion 433.4  
Finance leases    
2020 122.2  
2021 102.6  
2022 101.0  
2023 98.7  
2024 56.4  
Thereafter 459.4  
Total payments 940.3  
Less: present value discount (323.2)  
Present value of lease payments 617.1  
Current portion 81.5  
Noncurrent portion $ 535.6