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Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Summary of total debt
The following table summarizes the Company's total debt (in millions, except percentages):
 As of
 Maturity DateEffective Interest RatesMarch 31,
2021		December 31,
2020
Senior Notes ("Notes"):
4.500% fixed-rate notes ("2024 Notes")
March 20244.70 %$— $265.8 
4.350% fixed-rate notes ("2025-I Notes")
June 20254.47 %— 158.0 
1.200% fixed-rate notes ("2025-II Notes")
December 20251.37 %400.0 400.0 
3.750% fixed-rate notes ("2029 Notes")
August 20293.86 %500.0 500.0 
2.000% fixed-rate notes ("2030 Notes")
December 20302.12 %400.0 400.0 
5.950% fixed-rate notes ("2041 Notes")
March 20416.03 %400.0 400.0 
Total Notes1,700.0 2,123.8 
Unaccreted discount and debt issuance costs(14.1)(16.8)
Hedge accounting fair value adjustments(*)
(0.7)20.3 
Total$1,685.2 $2,127.3 
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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 5, Derivative Instruments, for a discussion of the Company's interest rate swaps.