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Common Stock and Earnings Per Share - Summary of Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |
Common Stock Outstanding, Shares | 37,500,000 | 35,800,000 |  |
Purchase of Non-Controlling Interest, Shares | 200,000 |  |  |
Contributions to Pension, Shares | 507,600 |  |  |
Contributions to Pension, Value | $ 20.0 |  |  |
Common Stock [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock Outstanding, Shares | 37,513,000 | 35,817,000 | 35,221,000 | 32,585,000
Common Stock Outstanding, Value | 705.6 | 636.1 | 613.4 | 534.1
Employee Stock Purchase Program, Shares | 20,000 | 19,000 | 24,000 |
Employee Stock Purchase Program, Value | 0.8 | 0.6 | 0.7 |
Invest Direct, Shares | 437,000 | 346,000 | 456,000 |
Invest Direct, Value | 17.2 | 11.7 | 13.6 |
Options and Stock Awards, Shares | 109,000 | 51,000 | 8,000 |
Options and Stock Awards, Value | 6.7 | 4.4 | 1.1 |
Equity Issuance Program, Shares | 400,000 | 180,000 | 1,685,000 |
Equity Issuance Program, Value | 16.0 | 6.0 | 51.9 |
Purchase of Non-Controlling Interest, Shares | 222,000 |  |  |
Purchase of Non-Controlling Interest, Value | 8.8 |  |  |
Contributions to Pension, Shares | 507,600 |  | 463,000 |
Contributions to Pension, Value | $ 20.0 |  | $ 12.0 |
Equity Issuance Program Shares Authorized | 6,600,000 |  |  |
Equity Issuance Program Shares Available for Issuance | 2,700,000 |  |  |

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