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Financial Instruments and Fair Value Measurements - Derivative Financial Instruments (Details) £ in Millions, $ in Millions | Sep. 30, 2020 GBP (£) derivative Rate | Sep. 30, 2020 USD ($) derivative Rate | Jun. 30, 2020 USD ($) derivative | Feb. 29, 2020 USD ($) derivative | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 1,223.3 |  |  | $ 673.4
Fair Value - asset (liability) |  | (52.3) |  |  | (26.3)
Interest rate swap, maturity Sep 2021 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 6.8 |  |  | 7.0
Strike (percent) | 6.03% | 6.03% |  |  |
Fair Value - asset (liability) |  | $ (0.2) |  |  | (0.2)
Interest rate swap, maturity Jun 2020 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 0.0 |  |  | 250.0
Strike (percent) | 1.72% | 1.72% |  |  |
Fair Value - asset (liability) |  | $ 0.0 |  |  | (0.1)
Interest rate swap, maturity Mar 2024 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 250.0 |  |  | 250.0
Strike (percent) | 3.04% | 3.04% |  |  |
Fair Value - asset (liability) |  | $ (24.4) |  |  | (14.7)
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | 41.6 |  |  | 41.6
Fair Value - asset (liability) |  | $ 1.5 |  |  | (2.6)
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 4.82% | 4.82% |  |  |
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 10.96% | 10.96% |  |  |
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | Cash flow hedge | USD |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 9.80% | 9.80% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 41.6 |  |  | 41.6
Fair Value - asset (liability) |  | $ 1.5 |  |  | (2.6)
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 4.82% | 4.82% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 10.96% | 10.96% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | Cash flow hedge | USD |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 9.803% | 9.803% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 41.6 |  |  | 41.6
Fair Value - asset (liability) |  | $ 1.2 |  |  | (2.9)
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 4.82% | 4.82% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 10.96% | 10.96% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | Cash flow hedge | USD |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 9.745% | 9.745% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 41.6 |  |  | 41.6
Fair Value - asset (liability) |  | $ 0.9 |  |  | (3.2)
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | GBP | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 4.82% | 4.82% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | GBP | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 10.96% | 10.96% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | Cash flow hedge | USD |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Strike (percent) | 9.755% | 9.755% |  |  |
Currency exchange swap | Not designated as hedging instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | £ 224.9 | $ 300.1 |  |  | 0.0
Strike (rate) | Rate | 133.00% | 133.00% |  |  |
Fair Value - asset (liability) |  | $ 9.5 |  |  | 0.0
Forward-starting swap, maturity Jun 2033 1 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 75.0 |  |  | 0.0
Strike (percent) | 2.02% | 2.02% |  |  |
Fair Value - asset (liability) |  | $ (7.1) |  |  | 0.0
Forward-starting swap, maturity Nov 2032 1 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 75.0 |  |  | 0.0
Strike (percent) | 1.94% | 1.94% |  |  |
Fair Value - asset (liability) |  | $ (7.1) |  |  | 0.0
Forward-starting swap, maturity Nov 2032 2 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 25.0 |  |  | 0.0
Strike (percent) | 1.67% | 1.67% |  |  |
Fair Value - asset (liability) |  | $ (1.7) |  |  | 0.0
Forward-starting swap, maturity Jun 2033 2 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 125.0 |  |  | 0.0
Strike (percent) | 1.75% | 1.75% |  |  |
Fair Value - asset (liability) |  | $ (8.5) |  |  | 0.0
Forward-starting swap, hybrid debt, maturity Nov 2032 3 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 125.0 |  |  | 0.0
Strike (percent) | 1.88% | 1.88% |  |  |
Fair Value - asset (liability) |  | $ (11.0) |  |  | 0.0
Forward-starting swap, hybrid debt, maturity Jun 2033 3 | Designated as hedging instrument | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 75.0 |  |  | 0.0
Strike (percent) | 2.00% | 2.00% |  |  |
Fair Value - asset (liability) |  | $ (6.9) |  |  | $ 0.0
Treasury rate locks | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  |  | $ 500.0 |
Number of derivative instruments | derivative |  |  |  | 5 |
Forward starting swaps | Cash flow hedge |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  | $ 500.0 |  |
Number of derivative instruments | derivative | 6 | 6 | 6 |  |

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