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Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Future amortization expense 2018 | $ 23.3 |  |
Future amortization expense 2019 | 22.1 |  |
Future amortization expense 2020 | 20.4 |  |
Future amortization expense 2021 | 19.3 |  |
Future amortization expense 2022 | 16.4 |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of intangible assets | 21.2 | $ 21.9 | $ 26.1
Acquired finite-lived intangible assets related to acquisitions | 7.0 | 29.0 |
Gross Amount | 350.5 | 332.2 |
Accumulated Amortization | (209.8) | (184.1) |
Net Amount | 140.7 | 148.1 |
Customer lists |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 267.3 | 252.4 |
Accumulated Amortization | (172.2) | (151.4) |
Net Amount | 95.1 | 101.0 |
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 68.8 | 65.5 |
Accumulated Amortization | (33.8) | (28.9) |
Net Amount | 35.0 | 36.6 |
Other intangible assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 14.4 | 14.3 |
Accumulated Amortization | (3.8) | (3.8) |
Net Amount | $ 10.6 | $ 10.5 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, useful life | 7 years |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, useful life | 15 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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