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Basis of Presentation and Use of Estimates - Revision from Prior Period (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Consolidated Statements of Income          
Income Taxes $ 51.3 $ 58.1 $ 161.1 $ 202.2  
Net income 174.9 191.0 531.6 599.2  
Net income (controlling interest) $ 109.2 $ 107.7 $ 321.1 $ 362.0  
Earnings per share—basic (in dollars per share) $ 2.03 $ 1.99 $ 5.96 $ 6.64  
Earnings per share—diluted (in dollars per share) $ 2.00 $ 1.96 $ 5.88 $ 6.51  
Consolidated Balance Sheet          
Additional paid-in capital $ 773.7   $ 773.7   $ 694.9
Retained earnings 2,902.7   2,902.7   2,581.6
Consolidated Statement of Cash Flows          
Net income 174.9 $ 191.0 531.6 $ 599.2  
Deferred income tax provision     $ 69.8 80.7  
Adjustment for Deferred Tax Benefit on Affiliate Equity Transactions | As Previously Reported          
Consolidated Statements of Income          
Income Taxes   56.8   198.5  
Net income   192.3   602.9  
Net income (controlling interest)   $ 109.0   $ 365.7  
Earnings per share—basic (in dollars per share)   $ 2.01   $ 6.71  
Earnings per share—diluted (in dollars per share)   $ 1.98   $ 6.57  
Consolidated Balance Sheet          
Additional paid-in capital         597.2
Retained earnings         2,679.3
Consolidated Statement of Cash Flows          
Net income   $ 192.3   $ 602.9  
Deferred income tax provision       77.0  
Adjustment for Deferred Tax Benefit on Affiliate Equity Transactions | Adjustments          
Consolidated Statements of Income          
Income Taxes $ 1.8 1.3   3.7  
Net income   (1.3)   (3.7)  
Net income (controlling interest)   $ (1.3)   $ (3.7)  
Earnings per share—basic (in dollars per share)   $ (0.02)   $ (0.07)  
Earnings per share—diluted (in dollars per share)   $ (0.02)   $ (0.06)  
Consolidated Balance Sheet          
Additional paid-in capital         97.7
Retained earnings         $ (97.7)
Consolidated Statement of Cash Flows          
Net income   $ (1.3)   $ (3.7)  
Deferred income tax provision       $ 3.7