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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) $ 31.4 $ 24.1 $ 17.5    
Income tax benefit recognized related to share-based compensation 3.0 3.7 3.2    
Consideration received from stock-based awards 31.8 24.9 15.1    
Excess income tax benefit recognized related to share-based compensation awards 3.1 3.7 1.2    
Options outstanding and exercisable [Abstract]          
Options outstanding, shares (in shares) 5,265,000        
Options outstanding, weighted-average remaining contractual life (in years) 5.7        
Options outstanding, weighted-average exercise price (in dollars per share) $ 50        
Options exercisable, shares (in shares) 3,626,000        
Options exercisable, weighted-average exercise price (in dollars per share) $ 51        
Employee Stock Option [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) 12.1 14.3 12.7    
Share-based compensation activity [Roll forward]          
Outstanding, beginning of period (in shares) 5,940,000 5,858,000 5,027,000    
Granted (in shares) 199,000 897,000 1,349,000    
Exercised (in shares) (721,000) (682,000) (339,000)    
Expired or cancelled (in shares) (153,000) (133,000) (179,000)    
Outstanding, end of period (in shares) 5,265,000 5,940,000 5,858,000    
Vested or expected to vest, end of period (in shares) 5,235,000 5,877,000 5,767,000    
Exercisable, end of period (in shares) 3,626,000 3,446,000 3,330,000    
Weighted average exercise price, Outstanding, beginning of period (in dollars per share) $ 48 $ 46 $ 50    
Weighted average exercise price, Granted (in dollars per share) $ 67 $ 53 $ 31    
Weighted average exercise price, Exercised (in dollars per share) $ 39 $ 37 $ 33    
Weighted average exercise price, Expired or cancelled (in dollars per share) $ 49 $ 50 $ 53    
Weighted average exercise price, Outstanding, end of period (in dollars per share) $ 50 $ 48 $ 46    
Weighted average exercise price, Vested or expected to vest, end of period (in dollars per share) $ 50 $ 48 $ 46    
Weighted average exercise price, Exercisable, end of period (in dollars per share) $ 51 $ 49 $ 47    
Weighted average remaining contractual term, Outstanding, end of period (in years) 5.7 6.2 6.1    
Weighted average remaining contractual term, Vested or expected to vest, end of period (in years) 5.6 6.1 6.1    
Weighted average remaining contractual term, Exercisable, end of period (in years) 4.8 4.7 4.4    
Aggregate intrinsic value, Exercised 13.0 14.0 5.0    
Aggregate intrinsic value, Outstanding, end of period 7.0        
Aggregate intrinsic value, Exercisable, end of period 4.0        
Fair value of options vested 14.3 12.7 13.3    
Total unrecognized compensation cost, net of estimated forfeitures 17.2        
Total unrecognized compensation cost, weighted-average period for recognition (in years) 1.6        
Assumptions used to estimate fair value [Abstract]          
Average risk-free interest rate (in hundredths) 2.60% 2.60% 1.80%    
Expected dividend yield (in hundredths) 1.10% 1.40% 2.50%    
Expected volatility (in hundredths) 41.00% 41.00% 42.00%    
Expected term (in years) 5.9 5.4 5.5    
Weighted average of daily historical volatility of Company's stock price, weight (in hundredths) 75.00%        
Implied volatility based on exchange traded options for Company's common stock, weight (in hundredths) 25.00%        
Weighted-average grant-date fair value of options granted (in dollars per share) $ 25.21 $ 19.26 $ 9.73    
Employee Stock Option [Member] | Exercise Price $26 - $34 [Member]
          
Options outstanding and exercisable [Abstract]          
Exercise price range, lower range limit (in dollars per share) $ 26        
Exercise price range, upper range limit (in dollars per share) $ 34        
Options outstanding, shares (in shares) 1,335,000        
Options outstanding, weighted-average remaining contractual life (in years) 6.2        
Options outstanding, weighted-average exercise price (in dollars per share) $ 31        
Options exercisable, shares (in shares) 724,000        
Options exercisable, weighted-average exercise price (in dollars per share) $ 31        
Employee Stock Option [Member] | Exercise Price $35 - $44 [Member]
          
Options outstanding and exercisable [Abstract]          
Exercise price range, lower range limit (in dollars per share) $ 35        
Exercise price range, upper range limit (in dollars per share) $ 44        
Options outstanding, shares (in shares) 807,000        
Options outstanding, weighted-average remaining contractual life (in years) 2.8        
Options outstanding, weighted-average exercise price (in dollars per share) $ 44        
Options exercisable, shares (in shares) 804,000        
Options exercisable, weighted-average exercise price (in dollars per share) $ 44        
Employee Stock Option [Member] | Exercise Price $45 - $55 [Member]
          
Options outstanding and exercisable [Abstract]          
Exercise price range, lower range limit (in dollars per share) $ 45        
Exercise price range, upper range limit (in dollars per share) $ 55        
Options outstanding, shares (in shares) 1,548,000        
Options outstanding, weighted-average remaining contractual life (in years) 6.4        
Options outstanding, weighted-average exercise price (in dollars per share) $ 53        
Options exercisable, shares (in shares) 899,000        
Options exercisable, weighted-average exercise price (in dollars per share) $ 53        
Employee Stock Option [Member] | Exercise Price $56 - $93 [Member]
          
Options outstanding and exercisable [Abstract]          
Exercise price range, lower range limit (in dollars per share) $ 56        
Exercise price range, upper range limit (in dollars per share) $ 93        
Options outstanding, shares (in shares) 1,575,000        
Options outstanding, weighted-average remaining contractual life (in years) 6.0        
Options outstanding, weighted-average exercise price (in dollars per share) $ 67        
Options exercisable, shares (in shares) 1,199,000        
Options exercisable, weighted-average exercise price (in dollars per share) $ 68        
Deferred Stock Units [Member] | Board Service [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) 0.8 0.3 0.7    
Share-based compensation activity [Roll forward]          
Outstanding, beginning of period (in shares) 4,448 13,378      
Outstanding, end of period (in shares) 8,732 4,448 13,378    
Deferred Stock Units [Member] | Cash Retainer [Member]
          
Share-based compensation activity [Roll forward]          
Outstanding, end of period (in shares) 23,566 18,403 17,288    
Restricted Stock Units [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) 7.0 4.4 5.5    
Share-based compensation activity [Roll forward]          
Total unrecognized compensation cost, net of estimated forfeitures 13.4        
Total unrecognized compensation cost, weighted-average period for recognition (in years) 2.6        
Restricted stock activity [Roll forward]          
Unvested, beginning of period (in shares) 295,000 369,000 192,000    
Granted (in shares) 264,000 21,000 197,000    
Vested (in shares) (143,000) (86,000) (15,000)    
Forfeited (in shares) (7,000) (9,000) (5,000)    
Unvested, end of period (in shares) 409,000 295,000 369,000 192,000  
Weighted average price per share, Unvested, beginning of period (in dollars per share) $ 45 $ 43 $ 55    
Weighted average price per share, Granted (in dollars per share) $ 67 $ 56 $ 31    
Weighted average price per share, Vested (in dollars per share) $ 46 $ 41 $ 34    
Weighted average price per share, Forfeited (in dollars per share) $ 52 $ 31 $ 45    
Weighted average price per share, Unvested, end of period (in dollars per share) $ 59 $ 45 $ 43 55  
Weighted average remaining contractual term, Unvested, end of period (in years) 1.8 0.9 1.6 2.7  
Aggregate intrinsic value, Unvested, end of period 15.0        
Restricted Stock Units [Member] | Board Service [Member]
          
Share-based compensation activity [Roll forward]          
Outstanding, end of period (in shares) 9,978 13,341 14,710    
Performance Share Units [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) 11.3 5.3 (1.5)    
Restricted stock activity [Roll forward]          
Granted (in shares)       140,000 118,000
Forfeited (in shares)       2,000 5,000
Performance Share Units [Abstract]          
Award payout percentage of performance target (in hundredths) 158.00% 183.00%      
Performance Share Units [Member] | Threshold Award [Member]
          
Performance Share Units Activity [Abstract]          
Performance period 2011 2010-2011   2008-2010 [1] 2007-2009 [2]
Savings Related Share Option Scheme [Abstract]          
Award Level 66,489 54,871   34,500 28,250
Performance Share Units [Member] | Target Award [Member]
          
Performance Share Units Activity [Abstract]          
Performance period 2011 2010-2011   2008-2010 [1] 2007-2009 [2]
Savings Related Share Option Scheme [Abstract]          
Award Level 132,978 109,742   138,000 113,000
Performance Share Units [Member] | Outstanding Award [Member]
          
Performance Share Units Activity [Abstract]          
Performance period 2011 2010-2011   2008-2010 [1] 2007-2009 [2]
Savings Related Share Option Scheme [Abstract]          
Award Level 265,956 219,484   241,500 197,750
Employee Stock Purchase Plan [Member]
          
Employee Stock Purchase Plan [Abstract]          
Purchase price (in hundredths) 100.00%        
U. K. Savings Related Share Option Scheme [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense / (benefit) $ 0.2 $ (0.2) $ 0.1    
Savings Related Share Option Scheme [Abstract]          
Requisite service period (in years) 1 year        
Purchase price, minimum (in hundredths) 85.00%        
Payroll deduction period to accumulate funds used for share-based payment award (in months) 60 months        
[1] 140,000 performance share units were granted in 2008 at the Target Award level for the 2008-2010 performance period, of which 2,000 units were forfeited.
[2] 118,000 performance share units were granted in 2007 at the Target Award level for the 2007-2009 performance period, of which 5,000 units were forfeited.