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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator    
Net income (controlling interest) $ 77.2 $ 62.4
Denominator    
Average shares outstanding - basic (in shares) 53.7 52.7
Effect of dilutive instruments:    
Stock options and restricted stock (in shares) 1.3 1.3
Forward equity (in shares) 0.2 0.2
Average shares outstanding—diluted (in shares) 55.2 54.2
Stock options and restricted stock [Member]
    
Anti-dilutive securities    
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0.3 0
Senior convertible securities [Member]
    
Anti-dilutive securities    
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0 3.6
Junior convertible trust preferred securities [Member]
    
Anti-dilutive securities    
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 3.7 4.2