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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Expected subsidies from Medicare in 2013 | $ 0.7
Expected subsidies from Medicare in 2014 | 0.9
Expected subsidies from Medicare in 2015 | 1.1
Expected subsidies from Medicare in 2016 | 1.3
Expected subsidies from Medicare in 2017 | 1.5
Expected subsidies from Medicare in 2018 to 2022 | 10.3
Defined Benefit Pension Plans [Member] |
Estimated benefit plan payments in 2013 | 60.9
Estimated benefit plan payments in 2014 | 59.9
Estimated benefit plan payments in 2015 | 71.3
Estimated benefit plan payments in 2016 | 60.4
Estimated benefit plan payments in 2017 | 60.8
Estimated benefit plan payments in 2018 to 2022 | 311.3
Postretirement Health and Life Benefits Plans [Member] |
Estimated benefit plan payments in 2013 | 15.3
Estimated benefit plan payments in 2014 | 16.3
Estimated benefit plan payments in 2015 | 18.4
Estimated benefit plan payments in 2016 | 21.0
Estimated benefit plan payments in 2017 | 22.7
Estimated benefit plan payments in 2018 to 2022 | $ 112.8

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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + 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 (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + 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 (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + 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 (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Amount of the prescription drug subsidy receipts to be received in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 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=21915506&loc=d3e1928-114920 + Details
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