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Afilliate Equity - Schedule of the effect of changes in the entity's ownership interest in its affiliates on the controlling interest's equity (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
Affiliate Equity [Abstract]                      
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
Increase (decrease) in controlling interest paid-in capital from the sale of Affiliate equity                 (74.0) (44.0) (28.1)
Change from Net income (controlling interest) and net transfers with non-controlling interests                 $ 286.5 $ 130.0 $ 136.8