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Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset, fair value $ 50.9 $ 24.7  
Derivative liability, fair value 5.2 6.6  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset, fair value 0.0 0.0  
Derivative liability, fair value 0.0 0.0  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset, fair value 50.9 24.7  
Derivative liability, fair value 5.2 6.6  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative asset, fair value 0.0 0.0  
Derivative liability, fair value $ 0.0 $ 0.0  
1.056% Senior term loan due 2020      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt instrument, interest rate, percent 1.056%   1.056%
1.002% Senior term loan due 2025      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt instrument, interest rate, percent 1.002% 1.002%