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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Cash paid for acquisition of businesses | $ 22.0 | $ 88.1
Acquisitions 2017 |  |
Business Acquisition [Line Items] |  |
Cash paid for acquisition of businesses |  | 87.1
Amounts due to sellers |  | 0.5
Non-monetary consideration |  | 8.1
Estimated purchase price |  | 95.7
Assets acquired: |  |
Property and equipment |  | 10.7
Goodwill and identifiable intangible assets |  | 85.0
Other current and long-term assets |  | 7.6
Liabilities assumed: |  |
Long-term liabilities and deferred tax liabilities |  | (7.7)
Estimated purchase price |  | $ 95.7

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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