Pension Benefit Plans (Fair Values Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3,115.2	$ 2,848.5
Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	648.4	610.1
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	541.1	515.3
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.7	44.6
Cash and equivalents | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.7	44.6
Common Stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	288.2	199.3
Common Stock | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	263.7	174.5
Common Stock | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.5	24.8
Preferred stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.6
Preferred stock | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.6
Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119.6	133.5
Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119.6	133.5
Government issued
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80.5	58.3
Government issued | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	80.5	58.3
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	554.0	580.5
Mutual funds | Quoted Prices in Active Market (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	357.4	391.0
Mutual funds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	196.6	189.5
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119.9	109.2
Insurance contracts | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	119.9	109.2
Total plan assets, excluding NAV assets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,189.5	1,125.4
NAV assets, mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	548.4	375.1
NAV assets, common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	742.5	852.9
NAV assets, venture capital,partnerships and other private investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 634.8	$ 495.1