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Derivative Instruments - Summary of Derivative Financial Instruments (Details) $ in Millions | Sep. 30, 2023 USD ($) derivative Rate | Dec. 31, 2022 USD ($)
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 5,041.3 | $ 3,463.2
Fair Value - asset (liability) | (33.6) | 17.7
Designated as hedging instrument |  |
Derivative [Line Items] |  |
Notional amount | 3,110.7 | 755.5
Fair Value - asset (liability) | (5.5) | (11.6)
Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Notional amount | 1,930.6 | 2,707.7
Fair Value - asset (liability) | $ (28.1) | 29.3
Interest rate swaps | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 9 |
Notional amount | $ 1,630.0 | 250.0
Weighted Average Strike Rate | 4.26% |
Fair Value - asset (liability) | $ 1.3 | 5.6
Interest rate swaptions | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 6 |
Notional amount | $ 1,000.0 | 0.0
Weighted Average Strike Rate | 5.625% |
Fair Value - asset (liability) | $ 21.7 | 0.0
Cross-currency swaps | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 3 |
Notional amount | $ 320.0 | 320.0
Weighted Average Strike Rate | 4.697% |
Fair Value - asset (liability) | $ (38.6) | (33.3)
Cross-currency swaps | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 3 |
Notional amount | $ 280.0 | 280.0
Fair Value - asset (liability) | $ (34.7) | (29.5)
Foreign currency forwards | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 26 |
Notional amount | $ 160.7 | 185.5
Fair Value - asset (liability) | $ 10.1 | 16.1
Weighted average forward exchange rate | Rate | 1.31% |
Currency exchange swaps | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Number of swaps executed | derivative | 6 |
Notional amount | $ 1,650.6 | 2,427.7
Fair Value - asset (liability) | $ 6.6 | $ 58.8
GBP currency exchange swap | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Weighted average forward exchange rate | Rate | 0.86% |
EUR currency exchange swap | Not designated as hedging instrument |  |
Derivative [Line Items] |  |
Weighted average forward exchange rate | Rate | 0.86% |
Interest Rate Swaption, Purchased | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Fixed strike rate | 3.75% |
Interest Rate Swaption, Sold | Designated as hedging instrument |  |
Derivative [Line Items] |  |
Fixed strike rate | 4.25% |

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