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Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Target Allocations [Abstract]

Equity securities

49.10%

Debt securities

24.60%

Real estate

8.10%

Other, including cash and cash equivalents

18.20%

Target allocation

1

Actual Allocation [Abstract]

Equity securities

50.60%

54.30%

Debt securities

23.60%

21.40%

Real estate

5.90%

5.40%

Other, including cash and cash equivalents

19.90%

18.90%

Actual allocation

100.00%

100.00%

Fair value of plan assets

$ 247.1

$ 255.2

$ 232.7

Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

97.0

106.9

Significant Other Observable Inputs (Level 2) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

89.2

89.0

Significant Unobservable Inputs (Level 3) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

60.9

59.3

54.8

Equity Investments [Member]

Actual Allocation [Abstract]

Fair value of plan assets

124.8

^[1]

138.5

^[1]

Equity Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

70.2

^[1]

81.1

^[1]

Equity Investments [Member] | Significant Other Observable Inputs (Level 2) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

54.6

^[1]

57.4

^[1]

Fixed Income Investments [Member]

Actual Allocation [Abstract]

Fair value of plan assets

58.1

^[2]

54.6

^[2]

Fixed Income Investments [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

26.5

^[2]

25.8

^[2]

Fixed Income Investments [Member] | Significant Other Observable Inputs (Level 2) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

31.6

^[2]

28.8

^[2]

Real Estate [Member]

Actual Allocation [Abstract]

Fair value of plan assets

14.5

^[3]

13.9

^[3]

Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

14.5

^[3]

13.9

^[3]

12.3

Multi-strategy Funds [Member]

Actual Allocation [Abstract]

Fair value of plan assets

46.4

^[4]

45.4

^[4]

Multi-strategy Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

46.4

^[4]

45.4

^[4]

42.5

Cash & Cash Equivalents [Member]

Actual Allocation [Abstract]

Fair value of plan assets

3.3

2.8

Cash & Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

0.3

Cash & Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]

Actual Allocation [Abstract]

Fair value of plan assets

$ 3.0

$ 2.8

[1]	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[2]	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[3]	Real estate investments are primarily invested in U.S. commercial real estate.
[4]	The multi-strategy funds invest in various hedge funds of fund strategies.

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The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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