Retirement Plans (Schedule Of Allocation of Plan Assets, Postretirement Benefit Plan) (Details) (Postretirement Benefits [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	$ 174.7	$ 191.9	$ 182.6
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets		16.7
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	174.7	175.2
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	17.7	4.1
Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets		4.1
Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	17.7
Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	114.3	149.4
Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets		12.4
Equity [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	114.3	137.0
Equity [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	42.7	38.2
Fixed Income [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Fixed Income [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	42.7	38.2
Fixed Income [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Derivative And Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets		0.2
Derivative And Other [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets		0.2
Derivative And Other [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets
Derivative And Other [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets