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Debt (Credit Facility) (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Line of Credit Facility [Line Items]      
Proceeds from lines of credit   $ 300,000,000 $ 0
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Proceeds from lines of credit $ 300,000,000.0    
Credit facility, remaining borrowing capacity   696,800,000  
2017 credit agreement | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 1,000,000,000.0