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Derivatives and Financial Instruments - Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 29, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lease liabilities | $ (15.2) | $ (18.4)
Deferred contingent consideration | (0.6) |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lease liabilities | 0.0 |
Deferred contingent consideration | 0.0 |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lease liabilities | (15.2) |
Deferred contingent consideration | 0.0 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Lease liabilities | 0.0 |
Deferred contingent consideration | (0.6) |
Loan Notes | Loan Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (25.0) |
Loan Notes | Loan Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (25.5) |
Loan Notes | Loan Notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (26.2) |
Loan Notes | Level 1 | Loan Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Loan Notes | Level 1 | Loan Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Loan Notes | Level 1 | Loan Notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Loan Notes | Level 2 | Loan Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (25.0) |
Loan Notes | Level 2 | Loan Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (25.5) |
Loan Notes | Level 2 | Loan Notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (26.2) |
Loan Notes | Level 3 | Loan Notes due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Loan Notes | Level 3 | Loan Notes due 2023 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Loan Notes | Level 3 | Loan Notes due 2026 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Revolving credit facility |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (31.7) |
Revolving credit facility | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | 0.0 |
Revolving credit facility | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | (31.7) |
Revolving credit facility | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest bearing loans and borrowings | $ 0.0 |

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