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Summary of Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule for Company's allowance for doubtful accounts | Changes in the Company's allowance for doubtful accounts for the years ended December 31 follows:
(in millions) |  | 2017 |  | 2016 |  | 2015
Balance as of January 1 |  | $ | 4.0 |  |  | $ | 4.7 |  |  | $ | 4.8 |
Provision charged to expense |  | 1.3 |  |  | 0.3 |  |  | 0.1 |
Amounts acquired |  | 2.0 |  |  | 0.4 |  |  | 1.5 |
Amounts written off, net of recoveries |  | (0.7 | ) |  | (1.4 | ) |  | (1.7 | )
Balance as of December 31 |  | $ | 6.6 |  |  | $ | 4.0 |  |  | $ | 4.7 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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