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Acquisitions, Discontinued Operations, and Other Dispositions - Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2018 | Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired |  |  |  |  |  |  |  |  |  |  | $ 147.1 | $ 180.8 | $ 0.0
Goodwill |  | $ 449.3 |  |  |  | $ 394.4 |  |  |  | $ 394.4 | 449.3 | 394.4 | 345.9
Net income (loss) |  | 25.4 | $ 21.5 | $ 19.2 | $ (0.8) | $ 39.2 | $ 6.6 | $ 23.0 | $ 12.4 |  | 65.3 | 81.2 | $ 89.3
Cues, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition and other investments, net of cash acquired | $ 164.4 |  |  | 164.4 |  |  |  |  |  |  |  |  |
Cash acquired | 20.6 |  |  | $ 20.6 |  |  |  |  |  |  |  |  |
Current assets, including cash and equivalents of $20.6 | 70.4 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 7.4 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 47.8 | $ 47.8 |  |  |  |  |  |  |  |  | 47.8 |  |
Intangible assets | 79.5 |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 2.3 |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired | 207.4 |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities assumed | 7.8 |  |  |  |  |  |  |  |  |  |  |  |
Non-current liabilities assumed | 14.6 |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired | 185.0 |  |  |  |  |  |  |  |  |  |  |  |
Gross receivables acquired | 13.6 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of gross receivables acquired | 13.2 |  |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition |  |  |  |  |  |  |  |  |  | 52.3 |  |  |
Loss of acquiree since acquisition date |  |  |  |  |  |  |  |  |  | 0.4 |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,572.7 | 1,511.4 |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  | 87.1 | 87.4 |
Net income |  |  |  |  |  |  |  |  |  |  | $ 90.1 | $ 92.7 |
Income from continuing operations per share - Basic (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 2.02 | $ 2.06 |
Income from continuing operations per share - Diluted (usd per share) |  |  |  |  |  |  |  |  |  |  | 1.95 | 1.99 |
Net income per share - Basic (usd per share) |  |  |  |  |  |  |  |  |  |  | 2.09 | 2.19 |
Net income per share - Diluted (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 2.02 | $ 2.11 |
Cues, Inc. | Fair Value Adjustment to Inventory |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (4.3) |  |  |
Trademarks | Cues, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | 27.6 |  |  |  |  |  |  |  |  |  |  |  |
Customer backlog | Cues, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 0.8 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 6 months |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | Cues, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 42.6 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 12 years |  |  |  |  |  |  |  |  |  |  |  |
Technology | Cues, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 8.5 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets amortization period (in years) | 11 years |  |  |  |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expenses | Cues, Inc. | Acquisition-related Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | $ (2.4) |  |

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