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Long-Term Debt (Maturities of Long Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt $ 2,052.3 $ 2,484.0
CMLP    
Debt Instrument [Line Items]    
2019 0.2  
2020 0.0  
2021 0.0  
2022 500.0  
2023 282.0  
Thereafter 1,300.0  
Total debt $ 2,082.2