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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator        
Net income (controlling interest) $ 64.7 $ 6.6 $ 127.1 $ 44.0
Denominator        
Average shares outstanding - basic (in shares) 53.1 51.4 52.9 51.5
Effect of dilutive instruments:        
Stock options and restricted stock (in shares) 1.2 1.3 1.2 1.3
Forward equity sales (in shares) 0.3 0 0.3 0
Average shares outstanding—diluted (in shares) 54.6 52.7 54.4 52.8
Stock options and other awards [Member]
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0 1.2 0 1.2
Senior convertible securities [Member]
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 3.6 3.7 3.6 3.7
Junior convertible trust preferred securities [Member]
        
Anti-dilutive securities        
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 4.1 4.1 4.1 4.1