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Employee Benefits (Details 4) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 SERP's | Dec. 31, 2011 Defined Benefit Plans | Dec. 31, 2011 Postretirement Medical Plans Y sponsor | Jan. 31, 2011 Postretirement Medical Plans | Dec. 31, 2011 Supplemental Bonus Plan | Dec. 31, 2010 Supplemental Bonus Plan | Dec. 31, 2009 Supplemental Bonus Plan
Effect of one-percentage-point change in assumed health care cost trend rates |  |  |  |  |  |  |  |  |
Effect of 1% increase on total service and interest cost components | $ 0.2 | $ 0.3 |  |  |  |  |  |  |
Effect of 1% decrease on total service and interest cost components | (0.2) | (0.2) |  |  |  |  |  |  |
Effect of 1% increase on postretirement benefit obligation | 1.0 | 2.1 |  |  |  |  |  |  |
Effect of 1% decrease on postretirement benefit obligation | (0.9) | (1.8) |  |  |  |  |  |  |
Employee Benefits |  |  |  |  |  |  |  |  |
Number of retiree health care plans sponsors |  |  |  |  | 2 |  |  |  |
Maximum age limit for eligibility (in years) |  |  |  |  | 65 |  |  |  |
Reduction to the benefit obligation due to amendment in terms of plan |  |  | 2.9 |  |  | 10.1 |  |  |
Average remaining years of service to full eligibility |  |  |  |  | 6 |  |  |  |
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods |  |  |  |  |  |  |  |  |
2012 |  |  | 1.3 | 3.0 | 1.0 |  |  |  |
2013 |  |  | 1.4 | 3.0 | 0.8 |  |  |  |
2014 |  |  | 2.1 | 3.2 | 0.9 |  |  |  |
2015 |  |  | 2.1 | 3.5 | 0.9 |  |  |  |
2016 |  |  | 2.0 | 3.5 | 0.9 |  |  |  |
2017-2021 |  |  | 13.1 | 20.5 | 6.3 |  |  |  |
Amounts in accumulated other comprehensive income that are expected to be recognized as components of net periodic benefit cost during 2012 |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 1.0 | 1.4 | 0.5 |  |  |  |
Prior service (credit) cost |  |  | (0.4) | 0.2 | (1.7) |  |  |  |
Total |  |  | 0.6 | 1.6 | (1.2) |  |  |  |
General disclosures of the plan |  |  |  |  |  |  |  |  |
Number of shares of the entity to be contributed to the plan as a result of acquisition |  |  |  |  |  |  | 258,006 |  |
Number of shares equivalent to the cash liability associated with post-employment liability |  |  |  |  |  |  | 136,200 |  |
Aggregate obligation to the plan acquired |  |  |  |  |  |  | 6.6 |  |
Expense (income) from mark to market adjustments |  |  |  |  |  |  | $ (0.2) | $ 1.1 | $ 3.5

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- Definition The effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520782 -Topic 715 -SubTopic 30 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520743 -Topic 715 -SubTopic 60 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph r -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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