Pension Benefit Plans (Fair Values Of Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2,555.4	$ 2,378.3
Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	876.3	961.8
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,364.7	1,100.6
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	314.4	315.9	165.0
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22.5	39.5
Cash | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	22.5	39.5
Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	319.9	348.6
Common Stock | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	298.5	290.4
Common Stock | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21.4	58.2
Common Stock | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0	0.7
Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	12.4
Preferred stock | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	12.4
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	155.9	171.9
Corporate bonds | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	155.9	171.9
Government issued
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	14.1
Government issued | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Government issued | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.0	14.1
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	954.6	899.3
Mutual funds | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	540.2	619.5
Mutual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	414.4	279.8
Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	664.9	515.4
Common/collective trusts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	664.9	515.4
Venture capital and partnerships
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163.9	163.9
Venture capital and partnerships | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163.9	163.9	62.6
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150.5	152.0
Real estate | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150.5	152.0	101.7
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	103.1	61.2
Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 103.1	$ 61.2