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Debt and Financing (Tables)
 12 Months Ended
Dec. 31, 2020
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,
 Maturity DateEffective Interest
Rates		20202019
Senior Notes ("Notes"):
4.500% fixed-rate notes(1) ("2024 Notes")
March 20244.70 %$265.8 $500.0 
4.350% fixed-rate notes ("2025-I Notes")
June 20254.47 %158.0 300.0 
1.200% fixed-rate notes ("2025-II Notes")
December 20251.37 %400.0 — 
3.750% fixed-rate notes ("2029 Notes")
August 20293.86 %500.0 500.0 
2.000% fixed-rate notes ("2030 Notes")
December 20302.12 %400.0 — 
5.950% fixed-rate notes ("2041 Notes")
March 2041 6.03 %400.0 400.0 
Total Notes2,123.8 1,700.0 
Unaccreted discount and debt issuance costs(16.8)(13.0)
Hedge accounting fair value adjustments(2)
20.3 (3.1)
Total$2,127.3 $1,683.9 
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(1)    2024 Notes issued in March 2014 and February 2016 form a single series and are fully fungible. The effective interest rate for 2014 and 2016 issuance is 4.63% and 4.87%, respectively, with the weighted average effective interest rate being 4.70%.
(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 5, Derivative Instruments, for a discussion of the Company's interest rate swaps.
Schedule of Maturities of Long-term Debt
As of December 31, 2020, the Company's aggregate debt maturities based on outstanding principal were as follows (in millions):
Years Ending December 31,Amount
2021(*)
$423.8 
2025400.0 
Thereafter1,300.0 
Total$2,123.8 
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(*)    Represents remaining outstanding 2024 Notes and 2025-I Notes redeemed by the Company in January 2021. See Note 17, Subsequent Events, for further discussion on the redemption.