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Goodwill and Identifiable Assets Acquired Intangible Assets (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 02, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible Assets [Line Items] |  |  |  |  |
Write-off Intangible Asset |  | $ 3.3 |  |  |
Amortization of intangible assets |  | 51.1 |  | $ 58.5 | $ 33.4
Identifiable intangible assets, net |  | 476.5 |  | 488.7 |
Intangible Assets, Gross (Excluding Goodwill) |  | 783.6 |  | 745.7 |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | 524.7 |  | 483.5 |
Accumulated Amortization |  | 307.1 |  | 257.0 |
Net Carrying Amount |  | 217.6 |  | 226.5 |
Intangible assets not subject to amortization: |  |  |  |  |
Trademarks, Carrying Amount |  | 258.9 | [1] | 262.2 |
Contractual customer relationships |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life | 12 years 9 months |  |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | 384.9 |  | 346.9 |
Accumulated Amortization |  | 179.9 |  | 145.4 |
Net Carrying Amount |  | $ 205.0 |  | 201.5 |
Contractual customer relationships | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 2 months |  |  |
Contractual customer relationships | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 12 years 9 months |  |  |
Contractor relations |  |  |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | $ 71.1 |  | 71.1 |
Accumulated Amortization |  | 70.6 |  | 67.1 |
Net Carrying Amount |  | $ 0.5 |  | 4.0 |
Contractor relations | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 2 years |  |  |
Contractor relations | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 5 years |  |  |
Backlog |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life | 2 years 9 months |  |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | $ 25.0 |  | 23.1 |
Accumulated Amortization |  | 23.9 |  | 17.7 |
Net Carrying Amount |  | $ 1.1 |  | 5.4 |
Backlog | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 1 year |  |  |
Backlog | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 2 years 9 months |  |  |
Non-compete agreements |  |  |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | $ 24.8 |  | 22.1 |
Accumulated Amortization |  | 13.8 |  | 9.9 |
Net Carrying Amount |  | $ 11.0 |  | 12.2 |
Non-compete agreements | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life | 4 years | 2 years |  |  |
Non-compete agreements | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life | 7 years | 7 years |  |  |
In-use software |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life |  | 6 years |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | $ 18.9 |  | 18.9 |
Accumulated Amortization |  | 18.9 |  | 16.0 |
Net Carrying Amount |  | $ 0.0 |  | 2.9 |
Favorable contracts |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Estimated Useful Life | 5 years | 5 years |  |  |
Intangible assets subject to amortization: |  |  |  |  |
Gross Carrying Amount |  | $ 0.0 |  | 1.4 |
Accumulated Amortization |  | 0.0 |  | 0.9 |
Net Carrying Amount |  | $ 0.0 |  | $ 0.5 |
[1] | Certain foreign trademarks totaling $3.3 million were written off during the second quarter of 2019.

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