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Employee Benefit Plans and Other Postretirement Plans - Fair Value Measurements of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

$ 805.9

$ 772.1

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

772.1

Fair value of plan assets at plan year end

805.9

772.1

Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.1

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.9

Acquisitions

0

Purchases

0

Sales

(3.4)

Unrealized gain

1.6

Fair value of plan assets at plan year end

8.1

Short-term Investments

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

1.8

^[1]

1.9

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

1.9

^[1]

Fair value of plan assets at plan year end

1.8

^[1]

1.9

^[1]

Short-term Investments | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Short-term Investments | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

1.8

^[1]

1.9

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

1.9

^[1]

Fair value of plan assets at plan year end

1.8

^[1]

1.9

^[1]

Short-term Investments | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

U.S. Large Value

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

14.8

^[2]

19.4

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

19.4

^[2]

Fair value of plan assets at plan year end

14.8

^[2]

19.4

^[2]

U.S. Large Value | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

14.8

^[2]

19.4

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

19.4

^[2]

Fair value of plan assets at plan year end

14.8

^[2]

19.4

^[2]

U.S. Large Value | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Large Value | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Large Growth

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

11.6

^[2]

17.2

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

17.2

^[2]

Fair value of plan assets at plan year end

11.6

^[2]

17.2

^[2]

U.S. Large Growth | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

11.6

^[2]

17.2

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

17.2

^[2]

Fair value of plan assets at plan year end

11.6

^[2]

17.2

^[2]

U.S. Large Growth | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Large Growth | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Mid-Cap Value

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

3.0

^[2]

3.1

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

3.1

^[2]

Fair value of plan assets at plan year end

3.0

^[2]

3.1

^[2]

U.S. Mid-Cap Value | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

3.0

^[2]

3.1

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

3.1

^[2]

Fair value of plan assets at plan year end

3.0

^[2]

3.1

^[2]

U.S. Mid-Cap Value | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Mid-Cap Value | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Mid-Cap Growth

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.8

^[2]

6.8

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

6.8

^[2]

Fair value of plan assets at plan year end

8.8

^[2]

6.8

^[2]

U.S. Mid-Cap Growth | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.8

^[2]

6.8

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

6.8

^[2]

Fair value of plan assets at plan year end

8.8

^[2]

6.8

^[2]

U.S. Mid-Cap Growth | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Mid-Cap Growth | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Foreign Large Blend (Mutual Funds)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

41.9

^[2]

45.2

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

45.2

^[2]

Fair value of plan assets at plan year end

41.9

^[2]

45.2

^[2]

Foreign Large Blend (Mutual Funds) | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

41.9

^[2]

45.2

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

45.2

^[2]

Fair value of plan assets at plan year end

41.9

^[2]

45.2

^[2]

Foreign Large Blend (Mutual Funds) | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Foreign Large Blend (Mutual Funds) | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Diversified Emerging Markets (Mutual Funds)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.0

^[2]

8.0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

8.0

^[2]

Fair value of plan assets at plan year end

8.0

^[2]

8.0

^[2]

Diversified Emerging Markets (Mutual Funds) | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.0

^[2]

8.0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

8.0

^[2]

Fair value of plan assets at plan year end

8.0

^[2]

8.0

^[2]

Diversified Emerging Markets (Mutual Funds) | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Diversified Emerging Markets (Mutual Funds) | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Real Estate

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.9

^[2]

7.5

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

7.5

^[2]

Fair value of plan assets at plan year end

8.9

^[2]

7.5

^[2]

Real Estate | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.9

^[2]

7.5

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

7.5

^[2]

Fair value of plan assets at plan year end

8.9

^[2]

7.5

^[2]

Real Estate | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Real Estate | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Fixed Income (Mutual Funds)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

178.2

^[2]

54.4

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

54.4

^[2]

Fair value of plan assets at plan year end

178.2

^[2]

54.4

^[2]

Fixed Income (Mutual Funds) | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

178.2

^[2]

54.4

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

54.4

^[2]

Fair value of plan assets at plan year end

178.2

^[2]

54.4

^[2]

Fixed Income (Mutual Funds) | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

Fixed Income (Mutual Funds) | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[2]

0

^[2]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[2]

Fair value of plan assets at plan year end

0

^[2]

0

^[2]

U.S. Large-Cap Equity Blend

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

92.9

^[1]

87.9

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

87.9

^[1]

Fair value of plan assets at plan year end

92.9

^[1]

87.9

^[1]

U.S. Large-Cap Equity Blend | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

U.S. Large-Cap Equity Blend | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

92.9

^[1]

87.9

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

87.9

^[1]

Fair value of plan assets at plan year end

92.9

^[1]

87.9

^[1]

U.S. Large-Cap Equity Blend | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

U.S. Small and Mid-Cap Equity Blend

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

20.5

^[1]

19.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

19.6

^[1]

Fair value of plan assets at plan year end

20.5

^[1]

19.6

^[1]

U.S. Small and Mid-Cap Equity Blend | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

U.S. Small and Mid-Cap Equity Blend | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

20.5

^[1]

19.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

19.6

^[1]

Fair value of plan assets at plan year end

20.5

^[1]

19.6

^[1]

U.S. Small and Mid-Cap Equity Blend | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Foreign Large Blend (Common/Collective Trust Funds)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

128.4

^[1]

126.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

126.6

^[1]

Fair value of plan assets at plan year end

128.4

^[1]

126.6

^[1]

Foreign Large Blend (Common/Collective Trust Funds) | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Foreign Large Blend (Common/Collective Trust Funds) | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

128.4

^[1]

126.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

126.6

^[1]

Fair value of plan assets at plan year end

128.4

^[1]

126.6

^[1]

Foreign Large Blend (Common/Collective Trust Funds) | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Diversified Emerging Markets (Common/Collective Trust Funds)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

9.4

^[1]

9.2

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.2

^[1]

Fair value of plan assets at plan year end

9.4

^[1]

9.2

^[1]

Diversified Emerging Markets (Common/Collective Trust Funds) | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Diversified Emerging Markets (Common/Collective Trust Funds) | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

9.4

^[1]

9.2

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.2

^[1]

Fair value of plan assets at plan year end

9.4

^[1]

9.2

^[1]

Diversified Emerging Markets (Common/Collective Trust Funds) | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Government Bonds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

35.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

35.6

^[1]

Fair value of plan assets at plan year end

35.6

^[1]

Government Bonds | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

Government Bonds | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

35.6

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

35.6

^[1]

Fair value of plan assets at plan year end

35.6

^[1]

Government Bonds | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

Corporate Bonds

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

77.2

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

77.2

^[1]

Fair value of plan assets at plan year end

77.2

^[1]

Corporate Bonds | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

Corporate Bonds | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

77.2

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

77.2

^[1]

Fair value of plan assets at plan year end

77.2

^[1]

Corporate Bonds | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

U.S. Small Blend

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.9

^[1]

6.8

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

6.8

^[1]

Fair value of plan assets at plan year end

8.9

^[1]

6.8

^[1]

U.S. Small Blend | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

U.S. Small Blend | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.9

^[1]

6.8

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

6.8

^[1]

Fair value of plan assets at plan year end

8.9

^[1]

6.8

^[1]

U.S. Small Blend | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Fixed Income (Common/Collective Trust Funds) [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

259.3

^[1]

234.4

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

234.4

^[1]

Fair value of plan assets at plan year end

259.3

^[1]

234.4

^[1]

Fixed Income (Common/Collective Trust Funds) [Member] | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Fixed Income (Common/Collective Trust Funds) [Member] | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

259.3

^[1]

234.4

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

234.4

^[1]

Fair value of plan assets at plan year end

259.3

^[1]

234.4

^[1]

Fixed Income (Common/Collective Trust Funds) [Member] | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[1]

0

^[1]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[1]

Fair value of plan assets at plan year end

0

^[1]

0

^[1]

Private Equity Securities

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.1

^[3]

9.9

^[3]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.9

^[3]

Fair value of plan assets at plan year end

8.1

^[3]

9.9

^[3]

Private Equity Securities | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[3]

0

^[3]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[3]

Fair value of plan assets at plan year end

0

^[3]

0

^[3]

Private Equity Securities | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

0

^[3]

0

^[3]

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

0

^[3]

Fair value of plan assets at plan year end

0

^[3]

0

^[3]

Private Equity Securities | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.1

^[3]

9.9

^[3]

Investment commitment

15.0

Unfunded portion of investment commitment

5.0

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.9

^[3]

Fair value of plan assets at plan year end

8.1

^[3]

9.9

^[3]

Total Securities at Fair Value

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

804.5

770.7

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

770.7

Fair value of plan assets at plan year end

804.5

770.7

Total Securities at Fair Value | Quoted prices in active markets for identical assets (Level 1)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

275.2

161.6

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

161.6

Fair value of plan assets at plan year end

275.2

161.6

Total Securities at Fair Value | Significant other observable inputs (Level 2)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

521.2

599.2

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

599.2

Fair value of plan assets at plan year end

521.2

599.2

Total Securities at Fair Value | Significant unobservable input (Level 3)

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

8.1

9.9

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

9.9

Fair value of plan assets at plan year end

8.1

9.9

Receivables and Accruals, Net [Member]

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value of plan assets

1.4

1.4

Level 3 fair value of pension plans' assets [Roll Forward]

Plan assets at fair value at beginning of period

1.4

Fair value of plan assets at plan year end

$ 1.4

$ 1.4

[1]	Investments in common/collective trust funds valued using net asset values (NAV) provided by the administrator of the funds. We use NAV as a practical expedient to fair value. The NAV is based on the value of the underlying assets owned by the fund, minus its liabilities, and then divided by the number of units outstanding. While the underlying assets are actively traded on an exchange, the funds are not. There are currently no redemption restrictions on these investments. There are certain funds with one-day redeemable notice.
[2]	Investments in mutual funds valued at quoted market values on the last business day of the fiscal year.
[3]	Investments in this category are invested in the Pantheon Global Secondary Fund IV, LP. The fund specializes in investments in the private equity secondary market and occasionally directly in private companies to maximize capital growth. Fund investments are carried at fair value as determined quarterly using the market approach to estimate the fair value of private investments. The market approach utilizes prices and other relevant information generated by market transactions, type of security, size of the position, degree of liquidity, restrictions on the disposition, latest round of financing data, current financial position, and operating results, among other factors. In circumstances where fair values are not provided with respect to any of the company's fund investments, the investment advisor will seek to determine the fair value of such investments based on information provided by the general partners or managers of such funds or from other sources. Audited financial statements are provided by fund management annually. Notwithstanding the above, the variety of valuation bases adopted and quality of management data of the ultimate underlying investee companies means that there are inherent difficulties in determining the value of the investments. Amounts realized on the sale of these investments may differ from the calculated values. Boise had originally committed to a $15.0 million investment, with $5.0 million of the commitment unfunded at December 31, 2014.