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Summary of Significant Accounting Policies Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, 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
Income [Abstract]                      
Net income $ 4.7 $ 146.4 $ 58.1 $ (9.3) $ 1.9 $ 126.6 $ 43.4 $ 2.3 $ 199.9 $ 174.2 $ 211.9
Less: net income (loss) attributable to noncontrolling interest                 0 (0.2) 0.2
Less: preferred stock dividend requirements                 1.6 1.6 1.6
Earnings available for common shareholders                 $ 198.3 $ 172.8 $ 210.1
Common Shares Outstanding [Abstract]                      
Average number of common shares outstanding (in shares)                 145.5 135.6 135.1
Add: effect of dilutive securities (in shares)                 1.7 3.1 1.8
Diluted average number of common shares outstanding (in shares)                 147.2 138.7 136.9
Earnings per share [Abstract]                      
Earnings Per Share, Basic         $ 0.01 $ 0.93 $ 0.32 $ 0.02 $ 1.36 $ 1.27 $ 1.55
Earnings Per Share, Diluted         $ 0.01 $ 0.91 $ 0.31 $ 0.01 $ 1.35 $ 1.25 $ 1.53