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Borrowings - Schedule of Outstanding Borrowings (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Mar. 31, 2021 | Mar. 09, 2021 | Dec. 31, 2020 | Nov. 25, 2019 | Dec. 18, 2018 | Jun. 18, 2018 | Aug. 22, 2017 | Mar. 15, 2017 | Nov. 22, 2013 | Jun. 21, 2010 | Nov. 17, 2006
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Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | $ 3,025.0 |  |  |  | $ 3,080.0 |  |  |  |  |  |  |  |  |
Debt issuance costs and unamortized discount, net |  | (16.6) |  |  |  | (12.8) |  |  |  |  |  |  |  |  |
Total borrowings at carrying value | [1] | 3,008.4 |  |  |  | 3,067.2 |  |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 275.0 |  |  |  | 80.0 |  |  |  |  |  |  |  |  |
3.350% Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 250.0 |  |
Floating Rate Notes Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  |  |  |  |  |  |  |  |  |  | $ 250.0 |  |  |  |
3.600% Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 500.0 |  |  |  | 500.0 | [2] |  |  |  | $ 100.0 | $ 400.0 |  |  |
4.250% Notes Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 300.0 | [3] |  |  | 300.0 | [3] |  |  | $ 300.0 |  |  |  |  |
2.850% Notes Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 500.0 | [3] |  |  | 500.0 | [3] | $ 500.0 |  |  |  |  |  |  |
1.350% Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 600.0 | [2] | $ 600.0 | $ 600.0 |  |  |  |  |  |  |  |  |  |
2.750% Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 300.0 | [2] |  | $ 300.0 |  |  |  |  |  |  |  |  |  |
6.200% Notes Due 2036 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 500.0 | [3] |  |  | 500.0 | [3] |  |  |  |  |  |  |  | $ 500.0
6.200% Notes Due 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | 250.0 | [3] |  |  | 250.0 | [3] |  |  |  |  |  |  | $ 250.0 |
Term Loan Facility Borrowing (Effective Rate of 1.4%) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings at par value |  | $ 300.0 | [2] |  |  | $ 950.0 | [2] |  | $ 950.0 |  |  |  |  |  |
[1] | As of December 31, 2021, the Company’s weighted-average effective rate on total borrowings was approximately 3.3%.
[2] | See the Term Loan Facility and Notes sections below for further discussion of the borrowings and repayments of the unsecured notes and term loan made in 2021.
[3] | The difference between the stated interest rate and the effective interest rate is not significant.

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