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Business Combinations (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Acquisition Method for Recording Business Combinations | During 2017, we acquired substantially all of the net assets of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data):
Name and Effective Date of Acquisition |  |  | Common Shares Issued |  |  |  | Common Share Value |  |  |  | Cash Paid |  |  |  | Accrued Liability |  |  |  | Escrow Deposited |  |  |  | Recorded Earnout Payable |  |  |  | Total Recorded Purchase Price |  |  |  | Maximum Potential Earnout Payable |
|  |  | (000s | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Construction Risk Solutions, LLC (CRS) January 1, 2017 |  |  | — |  |  | $ | — |  |  | $ | 27.9 |  |  | $ | — |  |  | $ | 3.1 |  |  | $ | 4.4 |  |  | $ | 35.4 |  |  | $ | 10.0 |
Hill, Chesson & Woody (HCW) January 1, 2017 |  |  | — |  |  |  | — |  |  |  | 34.8 |  |  |  | — |  |  |  | 0.7 |  |  |  | 15.9 |  |  |  | 51.4 |  |  |  | 24.4 |
Presidio Group, Inc. (PG) January 1, 2017 |  |  | — |  |  |  | — |  |  |  | 41.8 |  |  |  | — |  |  |  | 4.8 |  |  |  | 7.0 |  |  |  | 53.6 |  |  |  | 15.0 |
Commercial Insurance Brokers (CIB) April 1, 2017 |  |  | — |  |  |  | — |  |  |  | 17.7 |  |  |  | — |  |  |  | 2.0 |  |  |  | 0.8 |  |  |  | 20.5 |  |  |  | 3.6 |
Williams – Manny Insurance Group (WMI) May 1, 2017 |  |  | 170 |  |  |  | 9.8 |  |  |  | 28.2 |  |  |  | — |  |  |  | 2.0 |  |  |  | 5.4 |  |  |  | 45.4 |  |  |  | 11.5 |
GPL Assurance Inc. (GPL) August 1, 2017 |  |  | — |  |  |  | — |  |  |  | 37.8 |  |  |  | — |  |  |  | 4.2 |  |  |  | 5.8 |  |  |  | 47.8 |  |  |  | 8.0 |
Lutgert Insurance (LI) September 1, 2017 |  |  | — |  |  |  | — |  |  |  | 25.2 |  |  |  | — |  |  |  | 1.3 |  |  |  | 6.4 |  |  |  | 32.9 |  |  |  | 10.2 |
DiBrina Group (DBG) October 1, 2017 |  |  | — |  |  |  | — |  |  |  | 38.6 |  |  |  | — |  |  |  | 4.5 |  |  |  | 13.1 |  |  |  | 56.2 |  |  |  | 24.2 |
31 other acquisitions completed in 2017 |  |  | 518 |  |  |  | 27.9 |  |  |  | 120.4 |  |  |  | — |  |  |  | 12.0 |  |  |  | 42.4 |  |  |  | 202.7 |  |  |  | 94.1 |
|  |  | 688 |  |  | $ | 37.7 |  |  | $ | 372.4 |  |  | $ | — |  |  | $ | 34.6 |  |  | $ | 101.2 |  |  | $ | 545.9 |  |  | $ | 201.0 |
Summary of Estimated Fair Values of Net Assets Acquired | The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in 2017 (in millions):
|  | CRS |  |  | HCW |  |  | PG |  |  | CIB |  |  | WMI |  |  | GPL |  |  | LI |  |  | DBG |  |  | 31 Other Acquisitions |  |  | Total |
Cash |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | 8.9 |  |  | $ | 9.9 |
Other current assets |  |  | 3.6 |  |  |  | 2.1 |  |  |  | 2.4 |  |  |  | 3.6 |  |  |  | 1.8 |  |  |  | 13.6 |  |  |  | 1.2 |  |  |  | 0.3 |  |  |  | 9.6 |  |  |  | 38.2 |
Fixed assets |  |  | — |  |  |  | — |  |  |  | 0.5 |  |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 1.0 |  |  |  | 0.6 |  |  |  | 0.9 |  |  |  | 1.3 |  |  |  | 4.6 |
Noncurrent assets |  |  | — |  |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.2 |
Goodwill |  |  | 20.3 |  |  |  | 29.9 |  |  |  | 25.6 |  |  |  | 11.7 |  |  |  | 26.1 |  |  |  | 33.4 |  |  |  | 18.9 |  |  |  | 33.5 |  |  |  | 105.1 |  |  |  | 304.5 |
Expiration lists |  |  | 14.6 |  |  |  | 19.2 |  |  |  | 27.9 |  |  |  | 9.0 |  |  |  | 18.5 |  |  |  | 14.5 |  |  |  | 12.9 |  |  |  | 21.6 |  |  |  | 103.2 |  |  |  | 241.4 |
Non-compete agreements |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | 0.5 |  |  |  | 0.1 |  |  |  | — |  |  |  | 2.6 |  |  |  | 3.6 |
Trade names |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Total assets acquired |  |  | 38.6 |  |  |  | 51.5 |  |  |  | 56.5 |  |  |  | 24.5 |  |  |  | 47.0 |  |  |  | 63.5 |  |  |  | 33.9 |  |  |  | 56.3 |  |  |  | 230.7 |  |  |  | 602.5 |
Current liabilities |  |  | 3.2 |  |  |  | 0.1 |  |  |  | 2.9 |  |  |  | 4.0 |  |  |  | 1.6 |  |  |  | 11.6 |  |  |  | 1.0 |  |  |  | 0.1 |  |  |  | 12.5 |  |  |  | 37.0 |
Noncurrent liabilities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4.1 |  |  |  | — |  |  |  | — |  |  |  | 15.5 |  |  |  | 19.6 |
Total liabilities assumed |  |  | 3.2 |  |  |  | 0.1 |  |  |  | 2.9 |  |  |  | 4.0 |  |  |  | 1.6 |  |  |  | 15.7 |  |  |  | 1.0 |  |  |  | 0.1 |  |  |  | 28.0 |  |  |  | 56.6 |
Total net assets acquired |  | $ | 35.4 |  |  | $ | 51.4 |  |  | $ | 53.6 |  |  | $ | 20.5 |  |  | $ | 45.4 |  |  | $ | 47.8 |  |  | $ | 32.9 |  |  | $ | 56.2 |  |  | $ | 202.7 |  |  | $ | 545.9 |
Summary of Unaudited Pro Forma Historical Results | The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2016 (in millions, except per share data):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Total revenues |  | $ | 6,222.8 |  |  | $ | 5,765.9 |
Net earnings attributable to controlling interests |  |  | 466.3 |  |  |  | 414.5 |
Basic earnings per share |  |  | 2.58 |  |  |  | 2.33 |
Diluted earnings per share |  |  | 2.56 |  |  |  | 2.31 |

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