Retirement Plans (Schedule Of Allocation of Plan Assets, Pension Plan) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	$ 2,849.6	$ 3,029.6	$ 2,654.4
Cash And Cash Equivalents [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	65.2	13.4
Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	1,857.0	2,065.0
Fixed Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	779.1	841.6
Derivative And Other [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	6.9	5.3
Real Estate [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	111.3	88.8
Private Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	30.1	15.5
Fair Value, Inputs, Level 1 [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	1,873.3	1,919.4
Fair Value, Inputs, Level 1 [Member] | Cash And Cash Equivalents [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	43.4	13.4
Fair Value, Inputs, Level 1 [Member] | Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	1,604.4	1,683.3
Fair Value, Inputs, Level 1 [Member] | Fixed Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	214.8	213.7
Fair Value, Inputs, Level 1 [Member] | Derivative And Other [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	3.6	2.1
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	7.1	6.9
Fair Value, Inputs, Level 1 [Member] | Private Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 2 [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	946.2	1,094.7
Fair Value, Inputs, Level 2 [Member] | Cash And Cash Equivalents [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	21.8
Fair Value, Inputs, Level 2 [Member] | Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	252.6	381.7
Fair Value, Inputs, Level 2 [Member] | Fixed Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	564.3	627.9
Fair Value, Inputs, Level 2 [Member] | Derivative And Other [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	3.3	3.2
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	104.2	81.9
Fair Value, Inputs, Level 2 [Member] | Private Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	30.1	15.5
Fair Value, Inputs, Level 3 [Member] | Cash And Cash Equivalents [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Fixed Income [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Derivative And Other [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fair Value, Inputs, Level 3 [Member] | Private Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	30.1	15.5	6.9
Fair Value, Inputs, Level 3 [Member] | Private Equity [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	$ 30.1	$ 15.5