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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Numerator:        
Net income (controlling interest), as adjusted $ 54.9 $ 40.1 $ 98.9 $ 124.6
Denominator:        
Average shares outstanding - basic 51.7 51.9 51.6 51.9
Effect of dilutive instruments:        
Stock options and other awards (in shares) 1.3 1.1 1.3 1.3
Average shares outstanding - diluted 53.0 53.0 52.9 53.2
Stock transactions:        
Shares repurchased under share repurchase programs     0.6  
Stock options and other awards
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0.6 1.2 0.6 1.2
Senior convertible securities
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 3.7 3.7 3.7 3.7
Junior convertible trust preferred securities
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 4.2 4.2 4.2 4.2
Forward equity sales
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0.3   0.3