Employee Benefit Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 fund	Dec. 31, 2012
Short-term investments
Employee benefit plans
Value of Short term investments (in dollars per unit)	1.00
Pension plans
Employee benefit plans
Fair value of plan assets	$ 492.4	$ 770.4
Pension plans | Global Equity Common Trust Funds
Employee benefit plans
Fair value of plan assets	162.8	247.2
Pension plans | Global equity securities: Capital equipment
Employee benefit plans
Fair value of plan assets	1.9	4.8
Pension plans | Global equity securities: Consumer goods
Employee benefit plans
Fair value of plan assets	1.7	3.2
Pension plans | Global equity securities: Energy
Employee benefit plans
Fair value of plan assets	0.2	1.9
Pension plans | Global equity securities: Finance
Employee benefit plans
Fair value of plan assets	2.1	3.4
Pension plans | Global equity securities: Materials
Employee benefit plans
Fair value of plan assets	1.6	2.9
Pension plans | Global equity securities: Services
Employee benefit plans
Fair value of plan assets	0.8	1.4
Pension plans | Global equities
Employee benefit plans
Fair value of plan assets	4.6	8.9
Pension plans | Fixed Income Common Trust Funds
Employee benefit plans
Fair value of plan assets	178.2	212.2
Number of funds transferred from level 1 to level 2		1
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount		16.6	69.2
Number of funds transferred from level 2 to level 1		2
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount		27.6	46.3
Pension plans | Corporate bonds
Employee benefit plans
Fair value of plan assets	36.5
Pension plans | Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	28.5	42.4
Pension plans | U.S. Government securities
Employee benefit plans
Fair value of plan assets	12.0
Pension plans | Commingled Global Fund Allocations
Employee benefit plans
Fair value of plan assets	36.3	71.5
Pension plans | Short-term investments
Employee benefit plans
Fair value of plan assets	19.7	163.7
Pension plans | Other
Employee benefit plans
Fair value of plan assets	5.5	6.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans
Employee benefit plans
Fair value of plan assets	122.0	276.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global Equity Common Trust Funds
Employee benefit plans
Fair value of plan assets	15.0	37.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Capital equipment
Employee benefit plans
Fair value of plan assets	1.9	4.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Consumer goods
Employee benefit plans
Fair value of plan assets	1.7	3.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Energy
Employee benefit plans
Fair value of plan assets	0.2	1.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Finance
Employee benefit plans
Fair value of plan assets	2.1	3.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Materials
Employee benefit plans
Fair value of plan assets	1.6	2.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equity securities: Services
Employee benefit plans
Fair value of plan assets	0.8	1.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Global equities
Employee benefit plans
Fair value of plan assets	4.6	8.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Fixed Income Common Trust Funds
Employee benefit plans
Fair value of plan assets	15.1	27.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Corporate bonds
Employee benefit plans
Fair value of plan assets	36.5
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | U.S. Government securities
Employee benefit plans
Fair value of plan assets	12.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Commingled Global Fund Allocations
Employee benefit plans
Fair value of plan assets	10.5	20.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Short-term investments
Employee benefit plans
Fair value of plan assets	19.7	163.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension plans | Other
Employee benefit plans
Fair value of plan assets	0.3	0.5
Significant Observable Inputs (Level 2) | Securities collateralized
Employee benefit plans
Fair value of plan assets	7.0	13.7
Significant Observable Inputs (Level 2) | Pension plans
Employee benefit plans
Fair value of plan assets	360.3	480.8
Significant Observable Inputs (Level 2) | Pension plans | Global Equity Common Trust Funds
Employee benefit plans
Fair value of plan assets	142.9	202.5
Significant Observable Inputs (Level 2) | Pension plans | Fixed Income Common Trust Funds
Employee benefit plans
Fair value of plan assets	163.1	184.4
Significant Observable Inputs (Level 2) | Pension plans | Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	28.5	42.4
Significant Observable Inputs (Level 2) | Pension plans | Commingled Global Fund Allocations
Employee benefit plans
Fair value of plan assets	25.8	51.5
Significant Unobservable Inputs (Level 3)
Employee benefit plans
Fair value of plan assets	10.1	13.2	193.4
Significant Unobservable Inputs (Level 3) | Global Equity Common Trust Funds
Employee benefit plans
Fair value of plan assets	4.9	6.8	29.0
Significant Unobservable Inputs (Level 3) | Fixed Income Common Trust Funds
Employee benefit plans
Fair value of plan assets			1.4
Significant Unobservable Inputs (Level 3) | Commingled Global Fund Allocations
Employee benefit plans
Fair value of plan assets			155.6
Significant Unobservable Inputs (Level 3) | Other
Employee benefit plans
Fair value of plan assets	5.2	6.4	7.4
Significant Unobservable Inputs (Level 3) | Pension plans
Employee benefit plans
Fair value of plan assets	10.1	13.2
Significant Unobservable Inputs (Level 3) | Pension plans | Global Equity Common Trust Funds
Employee benefit plans
Fair value of plan assets	4.9	6.8
Significant Unobservable Inputs (Level 3) | Pension plans | Other
Employee benefit plans
Fair value of plan assets	$ 5.2	$ 6.4