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Debt (Tables)
9 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Summary of total debt
The following table summarizes the Company's total debt (in millions, except percentages):
 As of September 30, 2020
 Issuance dateMaturity DateAmountEffective Interest
Rates
Senior Notes ("Notes"):
4.500% fixed-rate notes ("2024 Notes")
March 2014March 2024$350.0 4.63 %
4.500% fixed-rate notes ("2024 Notes")
February 2016March 2024150.0 4.87 %
4.350% fixed-rate notes ("2025 Notes")
March 2015June 2025300.0 4.47 %
3.750% fixed-rate notes ("2029 Notes")
August 2019August 2029500.0 3.86 %
5.950% fixed-rate notes ("2041 Notes")
March 2011March 2041400.0 6.03 %
Total Notes1,700.0 
Unaccreted discount and debt issuance costs(11.8)
Hedge accounting fair value adjustments(*)
25.9 
Total$1,714.1 
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(*)     Represents the fair value adjustments for interest rate swaps 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.