Retirement Plans - Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 71.0	$ 71.7	$ 69.6
United States | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29.3	38.4
United States | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41.7	33.3
United States | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	71.0	71.7
United States | Short-term investments | Money market securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.5	6.3
United States | Short-term investments | Money market securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Short-term investments | Money market securities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Short-term investments | Money market securities | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.5	6.3
United States | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13.0	14.0
United States | Fixed income securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Fixed income securities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Fixed income securities | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13.0	14.0
United States | Equity securities | Large-cap growth funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Large-cap growth funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.1	14.0
United States | Equity securities | Large-cap growth funds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Large-cap growth funds | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.1	14.0
United States | Equity securities | International growth fund | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.5	7.4
United States | Equity securities | International growth fund | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.6	0
United States | Equity securities | International growth fund | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | International growth fund | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.1	7.4
United States | Equity securities | Commingled trust funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Commingled trust funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.2	7.7
United States | Equity securities | Commingled trust funds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Commingled trust funds | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.2	7.7
United States | Equity securities | Common stocks | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.3	10.7
United States | Equity securities | Common stocks | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Common stocks | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Equity securities | Common stocks | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.3	10.7
United States | Other investments | Abosolute return strategy funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Other investments | Abosolute return strategy funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.8	11.6
United States | Other investments | Abosolute return strategy funds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
United States | Other investments | Abosolute return strategy funds | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.8	11.6
International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26.1	58.0	53.5
International | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26.1	58.0
International | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26.1	58.0
International | Short-term investments | Short-term Investments - Other | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Short-term investments | Short-term Investments - Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.3
International | Short-term investments | Short-term Investments - Other | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Short-term investments | Short-term Investments - Other | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3	0.3
International | Fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Fixed income securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	23.5
International | Fixed income securities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Fixed income securities | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	23.5
International | Equity securities | Blended mutual funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
International | Equity securities | Blended mutual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15.3
International | Equity securities | Blended mutual funds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
International | Equity securities | Blended mutual funds | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		15.3
International | Other investments | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Other investments | Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19.7	18.9
International | Other investments | Insurance contracts | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International | Other investments | Insurance contracts | Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 19.7	$ 18.9