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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income (controlling interest) $ 75.0 $ 54.9 $ 6.6 $ 37.5 $ 40.3 $ 40.1 $ 45.4 $ 39.1 $ 174.0 $ 164.9 $ 138.6
Interest expense on convertible securities, net of taxes                     0.1
Net income (controlling interest), as adjusted                 $ 174.0 $ 164.9 $ 138.7
Denominator:                      
Average shares outstanding - basic                 51.7 51.8 47.4
Effect of dilutive instruments:                      
Stock options and other awards (in shares)                 1.3 1.2 1.0
Forward sale (in shares)                     0.6
Senior convertible securities (in shares)                     0.4
Average shares outstanding - diluted                 53.0 53.0 49.4
Stock transactions:                      
Shares repurchased under share repurchase programs                 0.6 0.7  
Stock options and other awards
                      
Anti-dilutive securities                      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)                 0.7 1.2 1.3
Senior convertible securities
                      
Anti-dilutive securities                      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)                 3.6 3.6 3.6
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
Forward equity sales
                      
Anti-dilutive securities                      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares)                 0.2