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Other Retirement Plans (Schedule of Multiemployer Plan Contributions and Covered Employees) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | $ 8.3 | $ 9.3 | $ 16.3 | $ 12.9
Multiemployer Plans, Pension [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | 7.9 | 9.1 | 15.5 | 12.5
Multiemployer Plans, Postretirement Benefit [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | $ 0.4 | $ 0.2 | $ 0.8 | $ 0.4
Workforce Subject to Collective Bargaining Arrangements [Member] | Minimum [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Entity number of employees during period | 1,149 | 1,608 | 778 | 308
Workforce Subject to Collective Bargaining Arrangements [Member] | Maximum [Member] |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Entity number of employees during period | 2,392 | 2,509 | 2,392 | 2,509

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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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