Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.10.0.1
Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Cash Equivalents   $ 34.4
Short-Term Investments in Marketable Securities $ 0.8 0.8
Restricted Cash 9.0 9.4
Derivatives 9.1 6.0
Total Assets 18.9 50.6
Liabilities:    
Derivatives 3.1 7.7
Deferred Compensation 26.4 34.1
Total Liabilities at Fair Value 29.5 41.8
Liabilities Measured at Net Asset Value 10.2 11.8
Total Liabilities 39.7 53.6
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Cash Equivalents   34.4
Short-Term Investments in Marketable Securities 0.8 0.8
Restricted Cash 9.0 9.4
Derivatives 0.0 0.0
Total Assets 9.8 44.6
Liabilities:    
Derivatives 0.0 0.0
Deferred Compensation 3.5 4.0
Total Liabilities at Fair Value 3.5 4.0
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 9.1 6.0
Total Assets 9.1 6.0
Liabilities:    
Derivatives 3.1 7.7
Deferred Compensation 22.9 30.1
Total Liabilities at Fair Value $ 26.0 $ 37.8