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Earnings Per Share - Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator                      
Net income (controlling interest) $ 158.2 $ 75.2 $ 64.7 $ 62.4 $ 75.0 $ 54.9 $ 6.6 $ 37.5 $ 360.5 $ 174.0 $ 164.9
Interest expense on convertible securities, net of taxes                 10.5 0 0
Net income (controlling interest), as adjusted                 $ 371.0 $ 174.0 $ 164.9
Denominator                      
Average shares outstanding - basic (in shares)                 53.1 51.7 51.8
Effect of dilutive instruments:                      
Stock options and other awards (in shares)                 1.3 1.3 1.2
Forward sale (in shares)                 0.3 0 0
Junior convertible securities (in shares)                 2.0 0 0
Average shares outstanding - diluted (in shares)                 56.7 53.0 53.0