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Financial Instruments and Fair Value Measurements - Derivative Financial Instruments (Details) - Cash flow hedge £ in Millions, $ in Millions | Sep. 30, 2019 USD ($) | May 31, 2019 GBP (£) | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 673.5 |  |  | $ 507.2
Fair Value - asset (liability) | (7.3) |  |  | (4.0)
Interest rate swap, maturity Sep 2021 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 7.1 |  |  | 7.2
Strike (percent) | 6.03% |  |  |
Fair Value - asset (liability) | $ (0.3) |  |  | (0.2)
Interest rate swap, maturity Jun 2020 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 250.0 |  |  | 250.0
Strike (percent) | 1.72% |  |  |
Fair Value - asset (liability) | $ 0.0 |  |  | 3.0
Interest rate swap, maturity Mar 2024 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 250.0 |  |  | 250.0
Strike (percent) | 3.04% |  |  |
Fair Value - asset (liability) | $ (17.4) |  |  | (6.8)
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | 41.6 |  |  | 0.0
Fair Value - asset (liability) | $ 2.9 |  |  | 0.0
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | GBP | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 4.82% |  |  |
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | GBP | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 10.96% |  |  |
Cross-currency swap, maturity May 2034 1 | Designated as hedging instrument | USD |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 9.80% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 41.6 |  |  | 0.0
Fair Value - asset (liability) | $ 2.9 |  |  | 0.0
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | GBP | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 4.82% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | GBP | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 10.96% |  |  |
Cross-currency swap, maturity May 2034 2 | Designated as hedging instrument | USD |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 9.803% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 41.6 |  |  | 0.0
Fair Value - asset (liability) | $ 2.4 |  |  | 0.0
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | GBP | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 4.82% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | GBP | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 10.96% |  |  |
Cross-currency swap, maturity May 2034 3 | Designated as hedging instrument | USD |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 9.745% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount | $ 41.6 |  |  | 0.0
Fair Value - asset (liability) | $ 2.2 |  |  | $ 0.0
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | GBP | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 4.82% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | GBP | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 10.96% |  |  |
Cross-currency swap, maturity May 2034 4 | Designated as hedging instrument | USD |  |  |  |
Derivative [Line Items] |  |  |  |
Strike (percent) | 9.755% |  |  |
Cross-currency swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Notional Amount |  | £ 130 | $ 166.0 |

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