Pension And Other Post-Retirement Benefits (Summary Of Changes In Benefit Obligations And Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Balance as of December 31, 2011	$ 133.0	$ 120.4
Pension and post-retirement benefits liability-current	(3.8)	(9.5)
Pension and post-retirement benefits liability-non current	(187.5)	(132.8)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning of the period	(242.5)	(213.0)
Service cost	(15.1)	(13.5)	(12.1)
Interest cost	(13.1)	(12.0)	(9.9)
Plan participants' contributions
Benefits paid	13.6	10.5
Actuarial gain (loss)	(4.9)	7.4
Assumption changes	(36.8)	(21.9)
Benefit obligation, end of the period	(298.8)	(242.5)	(213.0)
Balance as of December 31, 2010	120.4	108.2
Actual return on plan assets	0.8	13.9
Employer contributions	25.4	8.8
Balance as of December 31, 2011	133.0	120.4	108.2
Funded status of the plans	(165.8)	(122.1)
Pension and post-retirement benefits liability-current	(3.0)	(8.9)
Pension and post-retirement benefits liability-non current	(162.8)	(113.2)
Net amount recognized	(165.8)	(122.1)
Accumulated benefit obligation, end of the period	(256.1)	(214.6)
Other U.S Post-Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, beginning of the period	(15.6)	(13.1)
Service cost	(1.1)	(0.9)	(0.8)
Interest cost	(0.8)	(0.8)	(0.7)
Plan participants' contributions	(0.2)	(0.2)
Benefits paid	0.8	0.7
Actuarial gain (loss)	(0.9)	(0.4)
Assumption changes	(2.4)	(0.9)
Benefit obligation, end of the period	(20.2)	(15.6)	(13.1)
Balance as of December 31, 2010
Actual return on plan assets
Employer contributions	0.6	0.5
Balance as of December 31, 2011
Funded status of the plans	(20.2)	(15.6)
Pension and post-retirement benefits liability-current	(0.8)	(0.6)
Pension and post-retirement benefits liability-non current	(19.4)	(15.0)
Net amount recognized	$ (20.2)	$ (15.6)