Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Cash Equivalents $ 0.3  
Short-Term Investments in Marketable Securities 0.8 $ 0.8
Restricted Cash 11.6 9.0
Derivatives 4.2 7.6
Total Assets 16.9 17.4
Liabilities:    
Derivatives 3.2 2.2
Deferred Compensation 20.0 24.2
Total Liabilities at Fair Value 23.2 26.4
Liabilities Measured at Net Asset Value 8.5 10.2
Total Liabilities 31.7 36.6
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Cash Equivalents 0.3  
Short-Term Investments in Marketable Securities 0.8 0.8
Restricted Cash 11.6 9.0
Derivatives 0.0 0.0
Total Assets 12.7 9.8
Liabilities:    
Derivatives 0.0 0.0
Deferred Compensation 1.2 3.5
Total Liabilities at Fair Value 1.2 3.5
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Cash Equivalents 0.0  
Short-Term Investments in Marketable Securities 0.0 0.0
Restricted Cash 0.0 0.0
Derivatives 4.2 7.6
Total Assets 4.2 7.6
Liabilities:    
Derivatives 3.2 2.2
Deferred Compensation 18.8 20.7
Total Liabilities at Fair Value $ 22.0 $ 22.9