Pension and Other Post-Retirement Benefits (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Change in Fair Value of Plan Assets
Company contributions	$ 1.4	$ 0	$ 1.5
Amount Recognized
Other liabilities	(92.3)	(67.1)
Accumulative other comprehensive loss:
After-tax amount recognized in accumulated other comprehensive loss	(118.7)	(99.9)	(105.0)	(92.3)
Defined Benefit Pension [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	413.2	402.9
Service cost	5.4	5.3	4.8
Interest cost	20.7	22.1	23.7
Plan amendments		(0.2)
Actuarial loss (gain)	13.5	16.0
Benefits paid	(27.5)	(31.7)
Effect of foreign exchange rate changes	(0.3)	(1.2)
Benefit obligation at end of year	425.0	413.2	402.9
Change in Fair Value of Plan Assets
Plan assets at beginning of year	392.7	354.4
Actual return on plan assets	10.2	52.9
Effect of exchange rate changes	(0.1)	(1.2)
Company contributions	2.2	18.3
Benefits paid	(27.5)	(31.7)
Plan assets at end of year	377.5	392.7	354.4
Funded Status at end of year	(47.5)	(20.5)
Amount Recognized
Other liabilities	(47.5)	(20.5)
Accumulative other comprehensive loss:
Net actuarial loss	193.5	164.4
Prior service credit	(5.1)	(6.1)
Accumulated other comprehensive loss	188.4	158.3
Total recognized	140.9	137.8
After-tax amount recognized in accumulated other comprehensive loss	117.6	98.9
Retiree Health and Life [Member]
Change in Benefit Obligation
Benefit obligation at beginning of year	46.6	48.5
Service cost	0.2	0.2	0.2
Interest cost	2.2	2.4	2.9
Actuarial loss (gain)		(0.1)
Benefits paid	(4.2)	(4.4)
Benefit obligation at end of year	44.8	46.6	48.5
Change in Fair Value of Plan Assets
Plan assets at beginning of year	0
Company contributions	4.2	4.4
Benefits paid	(4.2)	(4.4)
Plan assets at end of year	0	0
Funded Status at end of year	(44.8)	(46.6)
Amount Recognized
Other liabilities	(44.8)	(46.6)
Accumulative other comprehensive loss:
Net actuarial loss	1.8	1.6
Prior service credit	0
Accumulated other comprehensive loss	1.8	1.6
Total recognized	(43.0)	(45.0)
After-tax amount recognized in accumulated other comprehensive loss	$ 1.1	$ 1.0