Pension Benefit Plans (Fair Values Of Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,378.3	$ 1,480.3
Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	961.8	896.6
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,100.6	418.7
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315.9	165.0	158.8
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39.5	16.8
Cash [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39.5	16.8
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	348.6	376.9
Common Stock [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290.4	376.2
Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58.2
Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0.7	6.4
Preferred Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	13.1
Preferred Stock [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12.4	13.1
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	171.9	92.4
Corporate Bonds [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		92.4
Corporate Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	171.9
Government Issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14.1	49.7
Government Issued [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		49.7
Government Issued [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14.1
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	899.3	359.8
Mutual Funds [Member] | Quoted Prices In Active Market (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	619.5	348.4
Mutual Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	279.8	11.4
Common/Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	515.4	372.7
Common/Collective Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	515.4	372.7
Venture Capital And Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163.9	62.6
Venture Capital And Partnerships [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163.9	62.6	52.2
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	152.0	101.7
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	152.0	101.7	100.2
Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61.2	34.6
Insurance Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 61.2	$ 34.6