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Financial Instruments and Fair Value Measurements - Derivative Financial Instruments (Details) - Designated as hedging instrument - Cash flow hedge - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 673.4 | $ 507.2
Fair Value - asset (liability) | (26.3) | (4.0)
Interest rate swap, maturity Sep 2021 |  |
Derivative [Line Items] |  |
Notional Amount | $ 7.0 | 7.2
Strike (percent) | 6.03% |
Fair Value - asset (liability) | $ (0.2) | (0.2)
Interest rate swap, maturity Jun 2020 |  |
Derivative [Line Items] |  |
Notional Amount | $ 250.0 | 250.0
Strike (percent) | 1.72% |
Fair Value - asset (liability) | $ (0.1) | 3.0
Interest rate swap, maturity Mar 2024 |  |
Derivative [Line Items] |  |
Notional Amount | $ 250.0 | 250.0
Strike (percent) | 3.04% |
Fair Value - asset (liability) | $ (14.7) | (6.8)
Cross-currency swap, maturity May 2034 1 |  |
Derivative [Line Items] |  |
Notional Amount | 41.6 | 0.0
Fair Value - asset (liability) | $ (2.6) | 0.0
Cross-currency swap, maturity May 2034 1 | GBP | Minimum |  |
Derivative [Line Items] |  |
Strike (percent) | 4.82% |
Cross-currency swap, maturity May 2034 1 | GBP | Maximum |  |
Derivative [Line Items] |  |
Strike (percent) | 10.96% |
Cross-currency swap, maturity May 2034 1 | USD |  |
Derivative [Line Items] |  |
Strike (percent) | 9.80% |
Cross-currency swap, maturity May 2034 2 |  |
Derivative [Line Items] |  |
Notional Amount | $ 41.6 | 0.0
Fair Value - asset (liability) | $ (2.6) | 0.0
Cross-currency swap, maturity May 2034 2 | GBP | Minimum |  |
Derivative [Line Items] |  |
Strike (percent) | 4.82% |
Cross-currency swap, maturity May 2034 2 | GBP | Maximum |  |
Derivative [Line Items] |  |
Strike (percent) | 10.96% |
Cross-currency swap, maturity May 2034 2 | USD |  |
Derivative [Line Items] |  |
Strike (percent) | 9.803% |
Cross-currency swap, maturity May 2034 3 |  |
Derivative [Line Items] |  |
Notional Amount | $ 41.6 | 0.0
Fair Value - asset (liability) | $ (2.9) | 0.0
Cross-currency swap, maturity May 2034 3 | GBP | Minimum |  |
Derivative [Line Items] |  |
Strike (percent) | 4.82% |
Cross-currency swap, maturity May 2034 3 | GBP | Maximum |  |
Derivative [Line Items] |  |
Strike (percent) | 10.96% |
Cross-currency swap, maturity May 2034 3 | USD |  |
Derivative [Line Items] |  |
Strike (percent) | 9.745% |
Cross-currency swap, maturity May 2034 4 |  |
Derivative [Line Items] |  |
Notional Amount | $ 41.6 | 0.0
Fair Value - asset (liability) | $ (3.2) | $ 0.0
Cross-currency swap, maturity May 2034 4 | GBP | Minimum |  |
Derivative [Line Items] |  |
Strike (percent) | 4.82% |
Cross-currency swap, maturity May 2034 4 | GBP | Maximum |  |
Derivative [Line Items] |  |
Strike (percent) | 10.96% |
Cross-currency swap, maturity May 2034 4 | USD |  |
Derivative [Line Items] |  |
Strike (percent) | 9.755% |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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