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Debt (Tables)
3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Summary of total debt
The following table summarizes the Company's total debt (in millions, except percentages):
 
As of March 31, 2020
 
Issuance date
 
Maturity Date
 
Amount
 
Effective Interest
Rates
Senior Notes ("Notes"):
 
 
 
 
 
 
 
4.500% fixed-rate notes ("2024 Notes")
March 2014
 
March 2024
 
$
350.0

 
4.63
%
4.500% fixed-rate notes ("2024 Notes")
February 2016
 
March 2024
 
150.0

 
4.87
%
4.350% fixed-rate notes ("2025 Notes")
March 2015
 
June 2025
 
300.0

 
4.47
%
3.750% fixed-rate notes ("2029 Notes")
August 2019
 
August 2029
 
500.0

 
3.86
%
5.950% fixed-rate notes ("2041 Notes")
March 2011
 
March 2041
 
400.0

 
6.03
%
Total Notes
 
 
 
 
1,700.0

 
 
Unaccreted discount and debt issuance costs
 
 
 
 
(12.7
)
 
 
Hedge accounting fair value adjustments(*)
 
 
 
 
25.6

 
 
Total
 
 
 
 
$
1,712.9

 
 
________________________________
(*)
Represents the fair value adjustments for interest rate swap contracts with an aggregate notional amount of $300.0 million designated as fair value hedges of our fixed-rate 2041 Notes. See Note 4, Derivative Instruments, for a discussion of the Company's interest rate swaps.