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Financing (Tables)
 6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Outstanding financing facilities
 
June 30, 2019
 
December 31, 2018
Revolving Credit Facility, weighted-average variable interest rate of
4.229%
 
$
156,000

 
$
287,000

$
500
 million,
4.875
%
Senior Notes due 2021,
effective interest rate of 4.951%
(1) 
498,775

 
498,371

$
300
 million,
4.625
%
Senior Notes due 2021,
effective interest rate of 4.644%
(2) 
299,385

 
299,244

$
300
 million,
3.800
%
Senior Notes due 2022,
effective interest rate of 3.845%
(3) 
298,759

 
298,574

$
300
 million,
3.850
%
Senior Notes due 2023,
effective interest rate of 3.851%
(4) 
298,943

 
298,821

$
500
 million,
3.550
%
Senior Notes due 2026,
effective interest rate of 3.570%
(5) 
496,470

 
496,240

$
750
 million,
3.600
%
Senior Notes due 2027,
effective interest rate of 3.619%
(6) 
744,172

 
743,868

$
500
 million,
4.350
%
Senior Notes due 2028,
effective interest rate of 4.383%
(7) 
495,222

 
495,004

$
500
 million,
3.900
%
Senior Notes due 2029,
effective interest rate of 3.901%
(8) 
496,012

 
—

Long-term debt
$
3,783,738

 
$
3,417,122

(1) 
Net of unamortized discount of $0.5 million as of June 30, 2019, and $0.7 million as of December 31, 2018, and debt issuance costs of $0.7 million as of June 30, 2019, and $0.9 million as of December 31, 2018.
(2) 
Net of unamortized discount of $0.1 million as of June 30, 2019, and December 31, 2018, and debt issuance costs of $0.5 million as of June 30, 2019, and $0.6 million as of December 31, 2018.
(3) 
Net of unamortized discount of $0.4 million as of June 30, 2019, and $0.5 million as of December 31, 2018, and debt issuance costs of $0.8 million as of June 30, 2019, and $1.0 million as of December 31, 2018.
(4) 
Net of unamortized discount of less than $0.1 million as of June 30, 2019, and December 31, 2018, and debt issuance costs of $1.0 million as of June 30, 2019, and $1.2 million as of December 31, 2018.
(5) 
Net of unamortized discount of $0.6 million as of June 30, 2019, and December 31, 2018, and debt issuance costs of $2.9 million as of June 30, 2019, and $3.1 million as of December 31, 2018.
(6) 
Net of unamortized discount of $1.0 million as of June 30, 2019, and $1.1 million as of December 31, 2018, and debt issuance costs of $4.8 million as of June 30, 2019 and $5.1 million as of December 31, 2018.
(7) 
Net of unamortized discount of $1.2 million as of June 30, 2019, and $1.3 million as of December 31, 2018, and debt issuance costs of $3.6 million as of June 30, 2019, and $3.7 million as of December 31, 2018.
(8) 
Net of unamortized discount of less than $0.1 million as of June 30, 2019, and debt issuance costs of $3.9 million as of June 30, 2019.