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Financial Instruments and Fair Value Measurements - Summary of Derivative Financial Instruments (Details) $ in Millions | Dec. 31, 2021 derivative | Dec. 31, 2021 USD ($) | Dec. 31, 2021 mortgage | Dec. 31, 2021 | Dec. 31, 2021 Rate | Dec. 31, 2020 USD ($) derivative | Jun. 30, 2020 USD ($) derivative | Feb. 29, 2020 USD ($) derivative
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Derivative [Line Items] |  |  |  |  |  |  |  |
Notional Amount |  | $ 2,731.9 |  |  |  | $ 1,541.4 |  |
Fair Value - asset (liability) |  | (41.1) |  |  |  | (81.5) |  |
Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional Amount |  | 1,092.4 |  |  |  | 916.4 |  |
Fair Value - asset (liability) |  | (26.4) |  |  |  | (73.3) |  |
Interest rate swaps | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 1 |  |  |  |  |  |  |
Interest rate swaps | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | mortgage |  |  | 1 |  |  |  |  |
Notional Amount |  | 250.0 |  |  |  | 250.0 |  |
Weighted Average Strike Rate |  |  |  | 3.04% |  |  |  |
Fair Value - asset (liability) |  | (11.9) |  |  |  | (22.6) |  |
Cross-currency swaps | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | mortgage |  |  | 4 |  |  |  |  |
Notional Amount |  | 166.3 |  |  |  | 166.4 |  |
Fair Value - asset (liability) |  | (13.8) |  |  |  | (21.4) |  |
GBP cross-currency swaps | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 4 |  |  |  |  |  |  |
Notional Amount |  | 166.3 |  |  |  |  |  |
GBP cross-currency swaps | Designated as hedging instrument | Cash flow hedge | Minimum |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Fixed strike rate |  |  |  | 4.82% |  |  |  |
GBP cross-currency swaps | Designated as hedging instrument | Cash flow hedge | Maximum |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Fixed strike rate |  |  |  | 10.96% |  |  |  |
GBP cross-currency swaps | Designated as hedging instrument | Cash flow hedge | Weighted Average |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted Average Strike Rate |  |  |  | 9.78% |  |  |  |
Foreign currency forwards | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | mortgage |  |  | 32 |  |  |  |  |
Notional Amount |  | 176.1 |  |  |  | 0.0 |  |
Fair Value - asset (liability) |  | 7.6 |  |  |  | $ 0.0 |  |
Weighted average forward exchange rate | Rate |  |  |  |  | 141.00% |  |  |
Forward-starting swaps | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 6 |  |  |  |  | 6 | 6 |
Notional Amount |  |  |  |  |  |  | $ 500.0 |
Forward-starting swaps | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 6 |  |  |  |  |  |  |
Forward-starting swap, derivative | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | 4 |  | 4 |  |  |  |  |
Notional Amount |  | 300.0 |  |  |  | $ 300.0 |  |
Weighted Average Strike Rate |  |  |  | 1.86% |  |  |  |
Fair Value - asset (liability) |  | (3.2) |  |  |  | (16.5) |  |
Forward-starting swaps, hybrid debt | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | 2 |  | 2 |  |  |  |  |
Notional Amount |  | 200.0 |  |  |  | 200.0 |  |
Weighted Average Strike Rate |  |  |  | 1.93% |  |  |  |
Fair Value - asset (liability) |  | (5.1) |  |  |  | (12.8) |  |
Currency exchange swap | Not designated as hedging instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | mortgage |  |  | 4 |  |  |  |  |
Notional Amount |  | 1,639.5 |  |  |  | 625.0 |  |
Fair Value - asset (liability) |  | (14.7) |  |  |  | (8.2) |  |
GBP currency exchange swap | Not designated as hedging instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 2 |  |  |  |  |  |  |
Notional Amount |  | 1,360.0 |  |  |  |  |  |
Weighted average forward exchange rate | Rate |  |  |  |  | 134.00% |  |  |
EUR currency exchange swap | Not designated as hedging instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative | 2 |  |  |  |  |  |  |
Notional Amount |  | $ 275.9 |  |  |  |  |  |
Weighted average forward exchange rate | Rate |  |  |  |  | 116.00% |  |  |
Treasury rate locks | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  | $ 500.0 |  | $ 500.0
Treasury rate locks | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Number of derivative instruments | derivative |  |  |  |  |  |  |  | 5

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