Quarterly report pursuant to Section 13 or 15(d)

Debt - Credit Facility (Details)

v3.10.0.1
Debt - Credit Facility (Details) - Line of credit - Revolving credit facility
1 Months Ended 3 Months Ended
Nov. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
quarter
Debt Instrument    
Debt instrument, term 5 years  
Maximum borrowing capacity $ 750,000,000.0  
Increase limit to borrowing capacity $ 250,000,000.0  
Commitment fee percentage (in bps)   0.125%
Covenant compliance, number of consecutive quarters | quarter   4
Covenant compliance, minimum interest expense coverage ratio   3.50
Maximum leverage ratio   3.00
Minimum leverage ratio under a material acquisition or series of material acquisitions   4.00
Outstanding borrowings under the unfunded Revolving Credit Facility   $ 0
Minimum    
Debt Instrument    
Commitment fee percentage (in bps)   0.10%
Minimum | Alternative base rate    
Debt Instrument    
Basis spread on variable rate (in bps)   0.00%
Minimum | LIBOR    
Debt Instrument    
Basis spread on variable rate (in bps)   1.00%
Maximum    
Debt Instrument    
Commitment fee percentage (in bps)   0.25%
Maximum | Alternative base rate    
Debt Instrument    
Basis spread on variable rate (in bps)   0.75%
Maximum | LIBOR    
Debt Instrument    
Basis spread on variable rate (in bps)   1.75%