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Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial Assets    
Netting Adjustments $ (1.4) $ 0.0 [1]
Assets, Fair Value Disclosure 23.4 24.8
Rabbi Trust Marketable Securities 23.4 23.1
Financial liabilities    
Netting Adjustments [1] (1.4) 0.0
Financial Liabilities Fair Value Disclosure 102.2 46.0
WRAP Plan Liabilities 25.5 26.8
Level 1 [Member]    
Financial Assets    
Assets, Fair Value Disclosure 23.4 23.1
Financial liabilities    
Financial Liabilities Fair Value Disclosure 25.5 26.8
Level 2 [Member]    
Financial Assets    
Assets, Fair Value Disclosure 1.4 1.7
Financial liabilities    
Financial Liabilities Fair Value Disclosure 78.1 19.2
Level 3 [Member]    
Financial Assets    
Assets, Fair Value Disclosure 0.0 0.0
Financial liabilities    
Financial Liabilities Fair Value Disclosure 0.0 0.0
Long term [Member]    
Financial Assets    
Netting Adjustments [1] 0.0 0.0
Derivative Asset 0.0 0.2
Rabbi Trust Marketable Securities 23.4 23.1
Financial liabilities    
Netting Adjustments [1] 0.0 0.0
Derivative Liability 0.3 0.5
WRAP Plan Liabilities 25.5 26.8
Long term [Member] | Level 1 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Investments, Fair Value Disclosure 23.4 23.1
Financial liabilities    
Derivative instruments 0.0 0.0
FairValueofDeferredCompensationLiabilities 25.5 26.8
Long term [Member] | Level 2 [Member]    
Financial Assets    
Derivative instruments 0.0 0.2
Financial liabilities    
Derivative instruments 0.3 0.5
Long term [Member] | Level 3 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Short term [Member]    
Financial Assets    
Netting Adjustments [1] (1.4) 0.0
Derivative Asset 0.0 1.5
Financial liabilities    
Netting Adjustments [1] (1.4) 0.0
Derivative Liability 76.4 18.7
Short term [Member] | Level 1 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments 0.0 0.0
Short term [Member] | Level 2 [Member]    
Financial Assets    
Derivative instruments 1.4 1.5
Financial liabilities    
Derivative instruments 77.8 18.7
Short term [Member] | Level 3 [Member]    
Financial Assets    
Derivative instruments 0.0 0.0
Financial liabilities    
Derivative instruments $ 0.0 $ 0.0
[1] The Company nets its derivative contract assets and liabilities outstanding with the same counterparty on the balance sheets for the contracts that contain netting provisions. Refer to Note 6 – Derivative Contracts for more information regarding the Company's derivative contracts.