XML 61 R48.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Segment Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Segment Reporting [Abstract] |
Reconciliation of operating results by reportable segment | The following table presents operating results by reportable segment for the years ended:
| December 31, 2016 |  | December 31, 2015 |  | December 31, 2014
| Property & Casualty Lines |  | Other |  | Total |  | Property & Casualty Lines |  | Other |  | Total |  | Property & Casualty Lines |  | Other |  | Total
(Amounts in millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ | 3,089.9 |  |  | $ | 41.9 |  |  | $ | 3,131.8 |  |  | $ | 2,906.6 |  |  | $ | 51.3 |  |  | $ | 2,957.9 |  |  | $ | 2,737.3 |  |  | $ | 58.9 |  |  | $ | 2,796.2 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment expenses | 2,333.2 |  |  | 21.9 |  |  | 2,355.1 |  |  | 2,117.3 |  |  | 28.2 |  |  | 2,145.5 |  |  | 1,951.4 |  |  | 34.7 |  |  | 1,986.1 |
Underwriting expenses | 780.4 |  |  | 17.5 |  |  | 797.9 |  |  | 770.0 |  |  | 20.0 |  |  | 790.0 |  |  | 749.7 |  |  | 25.9 |  |  | 775.6 |
Underwriting (loss) gain | (23.7 | ) |  | 2.5 |  |  | (21.2 | ) |  | 19.3 |  |  | 3.1 |  |  | 22.4 |  |  | 36.2 |  |  | (1.7 | ) |  | 34.5 |
Investment income |  |  |  |  | 121.9 |  |  |  |  |  |  | 126.3 |  |  |  |  |  |  | 125.7 |
Net realized investment (losses) gains |  |  |  |  | (34.3 | ) |  |  |  |  |  | (83.8 | ) |  |  |  |  |  | 81.2 |
Other income |  |  |  |  | 8.3 |  |  |  |  |  |  | 8.9 |  |  |  |  |  |  | 8.7 |
Interest expense |  |  |  |  | (4.0 | ) |  |  |  |  |  | (3.2 | ) |  |  |  |  |  | (2.6 | )
Pre-tax income |  |  |  |  | $ | 70.7 |  |  |  |  |  |  | $ | 70.6 |  |  |  |  |  |  | $ | 247.4 |
Net income |  |  |  |  |  |  | $ | 73.0 |  |  |  |  |  |  | $ | 74.5 |  |  |  |  |  |  | $ | 177.9 |
Schedule direct premiums attributable to segment | The following table presents the Company’s net premiums earned and direct premiums written by line of insurance business for the years ended:
| December 31, 2016 |  | December 31, 2015 |  | December 31, 2014
| Property & Casualty Lines |  | Other |  | Total |  | Property & Casualty Lines |  | Other |  | Total |  | Property & Casualty Lines |  | Other |  | Total
(Amounts in millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Private passenger automobile | $ | 2,435.7 |  |  | $ | — |  |  | $ | 2,435.7 |  |  | $ | 2,308.6 |  |  | $ | — |  |  | $ | 2,308.6 |  |  | $ | 2,203.0 |  |  | $ | — |  |  | $ | 2,203.0 |
Homeowners | 414.0 |  |  | — |  |  | 414.0 |  |  | 379.7 |  |  | — |  |  | 379.7 |  |  | 347.9 |  |  | — |  |  | 347.9 |
Commercial automobile | 161.3 |  |  | — |  |  | 161.3 |  |  | 144.4 |  |  | — |  |  | 144.4 |  |  | 121.8 |  |  | — |  |  | 121.8 |
Other | 78.9 |  |  | 41.9 |  |  | 120.8 |  |  | 73.9 |  |  | 51.3 |  |  | 125.2 |  |  | 64.6 |  |  | 58.9 |  |  | 123.5 |
Net premiums earned | $ | 3,089.9 |  |  | $ | 41.9 |  |  | $ | 3,131.8 |  |  | $ | 2,906.6 |  |  | $ | 51.3 |  |  | 2,957.9 |  |  | $ | 2,737.3 |  |  | $ | 58.9 |  |  | $ | 2,796.2 |
Private passenger automobile | $ | 2,452.7 |  |  | $ | — |  |  | $ | 2,452.7 |  |  | $ | 2,345.8 |  |  | $ | — |  |  | $ | 2,345.8 |  |  | $ | 2,223.1 |  |  | $ | — |  |  | $ | 2,223.1 |
Homeowners | 436.9 |  |  | — |  |  | 436.9 |  |  | 402.2 |  |  | — |  |  | 402.2 |  |  | 374.5 |  |  | — |  |  | 374.5 |
Commercial automobile | 166.1 |  |  | — |  |  | 166.1 |  |  | 153.5 |  |  | — |  |  | 153.5 |  |  | 135.9 |  |  | — |  |  | 135.9 |
Other | 89.0 |  |  | 27.3 |  |  | 116.3 |  |  | 81.6 |  |  | 29.8 |  |  | 111.4 |  |  | 75.4 |  |  | 44.3 |  |  | 119.7 |
Direct premiums written | $ | 3,144.7 |  |  | $ | 27.3 |  |  | $ | 3,172.0 |  |  | $ | 2,983.1 |  |  | $ | 29.8 |  |  | $ | 3,012.9 |  |  | $ | 2,808.9 |  |  | $ | 44.3 |  |  | $ | 2,853.2 |

X
- Definition Disclosure of direct premium written by line of business. + References No definition available. + Details
Name: | mcy_ScheduleDirectPremiumsAttributableToSegmentTableTextBlock
Namespace Prefix: | mcy_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
Name: | us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration