Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 259.3		$ 247.1		$ 255.2
Defined Benefit Plan, Benefits Paid	27.8		17.6
Maximum benefit amortization period	20 years
Approximate percentage of assets represented by most significant plans	80.00%
Approximate percentage of benefit obligations represented by most significant plans	82.00%
Rate of eligible compensation increase	4.00%
Trust assets, corporate owned life insurance policies	8.8		16.7
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	3.7		2.9		2.8
Interest cost	14.6		15.9		16.5
Expected return on plan assets	(16.8)		(18.2)		(18.2)
Amortization of prior service cost	0.3		0.3		0.3
Amortization of net actuarial loss	6.6		4.6		2.7
Net periodic pension cost	8.4		5.5		4.1
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	4.41%		5.12%		5.95%
Rate of compensation increase	0.70%		0.60%		0.60%
Expected return on plan assets	6.87%		7.04%		7.17%
Other changes in plan assets and benefit obligations recognized in other comprehensive incom [Abstract]
Net actuarial (gain) loss	11.3		43.2		13.1
Amortization of net actuarial loss	(6.6)		(4.6)		(2.7)
Amortization of prior service cost	(0.3)		(0.3)		(0.4)
Settlement	(2.2)		0		0
Foreign exchange rate changes	0		(0.1)		0.2
Total recognized in OCI	2.2		38.2		10.2
Expected contribution to pension plans in 2012	2
Benefits Expected to be Paid from Benefit Plans [Abstract]
2012	18.1
2013	25.5
2014	20.0
2015	20.5
2016	23.6
2017 - 2021	112.5
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefits Paid	(10.4)
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	101.1		97.0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	93.5		89.2
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	64.7		60.9		59.3
Diversified real asset funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	11.8	[1]
Diversified real asset funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	11.8	[1]
Diversified real asset funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[1]
Diversified real asset funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[1]
Domestic stock funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	54.6	[2]	78.4	[2]
Domestic stock funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	25.0	[2]	47.0	[2]
Domestic stock funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	29.6	[2]	31.4	[2]
Domestic stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]	0	[2]
International stock funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	39.6	[2]	46.4	[2]
International stock funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	12.1	[2]	23.2	[2]
International stock funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	27.5	[2]	23.2	[2]
International stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]	0	[2]
Domestic bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	52.2	[1]	26.5	[2]
Domestic bond funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	52.2	[2]	26.5	[2]
Domestic bond funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]	0	[2]
Domestic bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]	0	[2]
International bond funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	34.0	[1]	31.6	[1]
International bond funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]		[2]
International bond funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	34.0	[2]	31.6	[2]
International bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[2]	0	[2]
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	15.2	[3]	14.5	[3]
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[3]	0	[3]
Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[3]	0	[3]
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	15.2	[3]	14.5	[3]	13.9
Multi-strategy Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	49.5	[4]	46.4	[4]
Multi-strategy Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[4]	0	[4]
Multi-strategy Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0	[4]	0	[4]
Multi-strategy Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	49.5	[4]	46.4	[4]	45.4
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.4		3.3
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	0		0.3
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	2.4		3.0
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets	$ 0		$ 0

[1] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.

[2] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.

[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.