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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) (USD $)
In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Pension [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

$ 501.6

$ 460.1

$ 432.4

Pension [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

234.2

213.0

Pension [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

194.1

163.3

Pension [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

73.3

83.8

Pension [Member] | U.S. Large-cap [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

80.2

^[1]

79.0

^[1]

Pension [Member] | U.S. Large-cap [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

20.9

^[1]

43.0

^[1]

Pension [Member] | U.S. Large-cap [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

59.3

^[1]

36.0

^[1]

Pension [Member] | U.S. Large-cap [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[1]

0

^[1]

Pension [Member] | U.S. Mid-cap Growth [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

36.1

^[1]

33.6

^[1]

Pension [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

9.4

^[1]

18.3

^[1]

Pension [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

26.7

^[1]

15.3

^[1]

Pension [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[1]

0

^[1]

Pension [Member] | U.S. Small-cap [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

38.1

^[1]

33.6

^[1]

Pension [Member] | U.S. Small-cap [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

9.9

^[1]

18.3

^[1]

Pension [Member] | U.S. Small-cap [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

28.2

^[1]

15.3

^[1]

Pension [Member] | U.S. Small-cap [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[1]

0

^[1]

Pension [Member] | International [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

104.7

96.4

Pension [Member] | International [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

61.2

50.5

Pension [Member] | International [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

43.5

45.9

Pension [Member] | International [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Mutual Funds [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

130.1

72.5

Pension [Member] | Mutual Funds [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

130.1

72.5

Pension [Member] | Mutual Funds [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Mutual Funds [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Fixed Income [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

36.4

61.2

Pension [Member] | Fixed Income [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

10.4

Pension [Member] | Fixed Income [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

36.4

50.8

Pension [Member] | Fixed Income [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Cash Equivalents [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

2.7

Pension [Member] | Cash Equivalents [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

2.7

Pension [Member] | Cash Equivalents [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

Pension [Member] | Cash Equivalents [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

Pension [Member] | Private Equity Funds [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

46.8

58.9

Pension [Member] | Private Equity Funds [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Private Equity Funds [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Private Equity Funds [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

46.8

58.9

Pension [Member] | Real Estate [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

26.5

24.9

Pension [Member] | Real Estate [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Real Estate [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Pension [Member] | Real Estate [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

26.5

24.9

Postretirement Health and Life [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

157.0

131.0

121.0

Postretirement Health and Life [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

128.4

99.2

Postretirement Health and Life [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

15.5

18.3

Postretirement Health and Life [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

13.1

13.5

Postretirement Health and Life [Member] | U.S. Large-cap [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

28.3

^[2]

16.7

^[2]

Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

28.3

^[2]

16.7

^[2]

Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

17.6

^[2]

13.2

^[2]

Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

17.6

^[2]

13.2

^[2]

Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | U.S. Small-cap [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

18.2

^[2]

13.3

^[2]

Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

18.2

^[2]

13.3

^[2]

Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

^[2]

0

^[2]

Postretirement Health and Life [Member] | International [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

33.4

30.3

Postretirement Health and Life [Member] | International [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

33.4

30.3

Postretirement Health and Life [Member] | International [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | International [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Mutual Funds [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

30.8

25.5

Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

30.8

25.5

Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Fixed Income [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

15.5

18.5

Postretirement Health and Life [Member] | Fixed Income [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0.2

Postretirement Health and Life [Member] | Fixed Income [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

15.5

18.3

Postretirement Health and Life [Member] | Fixed Income [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Cash Equivalents [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0.1

Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0.1

Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

Postretirement Health and Life [Member] | Private Equity Funds [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

13.1

13.5

Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 1 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 2 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

0

0

Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 3 [Member]

Recurring Fair Value Measures [Line Items]

Fair Value of Assets

$ 13.1

$ 13.5

[1]

The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.

[2]

The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

X

- Definition

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.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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X

- Details

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