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Debt and Financing (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Instruments [Abstract]  
Schedule of Long-term Debt
The following table summarizes the Company's total debt (in millions, except percentages):
 
As of December 31, 2019
 
Issuance date
 
Maturity Date
 
Amount
 
Effective Interest
Rates
Senior Notes ("Notes"):
 
 
 
 
 
 
 
4.500% fixed-rate notes(1) ("2024 Notes")
March 2014
 
March 2024
 
$
350.0

 
4.63
%
4.500% fixed-rate notes(1) ("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
 
 
 
 
(13.0
)
 
 
Hedge accounting fair value adjustments(2)
 
 
 
 
(3.1
)
 
 
Total
 
 
 
 
$
1,683.9

 
 

________________________________
(1)
2024 Notes issued in March 2014 and February 2016 form a single series and are fully fungible.
(2)
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 6, Derivative Instruments, for a discussion of the Company's interest rate swaps.
Schedule of Maturities of Long-term Debt
As of December 31, 2019, the Company's aggregate debt maturities based on outstanding principal were as follows (in millions):
Years Ending December 31,
Amount
2020
$
—

2021
—

2022
—

2023
—

2024
500.0

Thereafter
1,200.0

Total
$
1,700.0