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Investments in and Advances to Nonconsolidated Affiliates - Schedule of Other Long-term Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Equity method investments:    
Capital contributions $ 0.9 $ 0.9
Cumulative share of income 114.0 105.3
Cumulative share of distributions (102.7) (94.5)
Equity Method Investments 12.2 11.7
Cost method investments:    
Capital contributions, net of distributions and impairments 0.0 0.2
Total Investments in and advances to nonconsolidated affiliates $ 12.2 $ 11.9