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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
entity
Dec. 31, 2018
USD ($)
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]      
Investments in and advances to nonconsolidated affiliates | $   $ 13.9 $ 12.2
Number of partially owned subsidiaries | entity   6  
Number of partially owned general or limited partnerships, limited liability companies of joint ventures | entity   5  
Document Period End Date   Jun. 30, 2019  
Minimum [Member]      
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]      
Ownership interest in affiliates (percent)   8.00%  
Maximum [Member]      
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]      
Ownership interest in affiliates (percent)   60.00%  
Subsequent Event [Member] | Forecast [Member]      
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]      
Remeasurement gain | $ $ 20.0