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Stock-Based Compensation (Schedule Of Stock Unit Information) (Details)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 1.2
Granted based on current service at 1 authorization share (in shares) 0.5
Granted based on future conditions at 1 authorization share (in shares) 0.3
Vested at 1 authorization share (in shares) (0.9)
Difference between maximum and actual payout (0.1)
Award elected to be paid in cash 0.4
Non-vested (in shares) 0.6
Weighted Average Grant Date Fair Value per Unit  
Non-vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 20.30
Granted based on current service | $ / shares 48.12
Granted based on future conditions | $ / shares 24.97
Vested | $ / shares 31.57
Difference between maximum and actual payout | $ / shares 0.00
Award elected to be paid in cash | $ / shares 19.32
Non-vested, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares $ 19.56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]  
Fully vested stock units outstanding at December 31, 2012 (in shares) 3.7
Total non-vested at December 31, 2012, Aggregate Intrinsic Value | $ $ 30.8
Fully vested stock units outstanding at December 31, 2012, Aggregate Intrinsic Value | $ $ 178.1
DSU  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 0.0
Granted based on current service at 1 authorization share (in shares) 0.2
Granted based on future conditions at 1 authorization share (in shares) 0.0
Vested at 1 authorization share (in shares) (0.2)
Difference between maximum and actual payout 0.0
Award elected to be paid in cash 0.0
Non-vested (in shares) 0.0
ESUP  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 0.0
Granted based on current service at 1 authorization share (in shares) 0.2
Granted based on future conditions at 1 authorization share (in shares) 0.0
Vested at 1 authorization share (in shares) (0.2)
Difference between maximum and actual payout 0.0
Award elected to be paid in cash 0.0
Non-vested (in shares) 0.0
PSU  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 0.9
Granted based on current service at 1 authorization share (in shares) 0.0
Granted based on future conditions at 1 authorization share (in shares) 0.2
Vested at 1 authorization share (in shares) (0.4)
Difference between maximum and actual payout 0.0
Award elected to be paid in cash 0.3
Non-vested (in shares) 0.4
RSU  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 0.1
Granted based on current service at 1 authorization share (in shares) 0.1
Granted based on future conditions at 1 authorization share (in shares) 0.0
Vested at 1 authorization share (in shares) (0.1)
Difference between maximum and actual payout 0.0
Award elected to be paid in cash 0.0
Non-vested (in shares) 0.1
PGI  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested (in shares) 0.2
Granted based on current service at 1 authorization share (in shares) 0.0
Granted based on future conditions at 1 authorization share (in shares) 0.1
Vested at 1 authorization share (in shares) 0.0
Difference between maximum and actual payout (0.1)
Award elected to be paid in cash 0.1
Non-vested (in shares) 0.1