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Commitments and Contingencies, Additional Lease Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Lease Accounting Standard [Abstract]      
Right-of-use assets $ 219.5 $ 219.5  
Lease liabilities 221.1 221.1  
Operating lease income $ 3.5 $ 10.7  
Maximum [Member]      
Lease Accounting Standard [Abstract]      
Percentage of revenues from operating lease income 1.00% 1.00%  
Percentage of operating expense from operating lease expense 1.00% 1.00%  
ASC 842 [Member]      
Lease Accounting Standard [Abstract]      
Right-of-use assets     $ 246.1
Lease liabilities     $ 246.1
ASC 842 [Member] | Maximum [Member]      
Lease Accounting Standard [Abstract]      
Percentage impact of adopting new accounting pronouncement on total assets     1.00%
Percentage impact of adopting new accounting pronouncement on total liabilities     1.00%