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Earnings Per Share - Schedule of Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator                      
Net income (controlling interest) $ 172.6us-gaap_NetIncomeLoss $ 103.2us-gaap_NetIncomeLoss [1] $ 99.1us-gaap_NetIncomeLoss [1] $ 77.2us-gaap_NetIncomeLoss $ 158.2us-gaap_NetIncomeLoss $ 75.2us-gaap_NetIncomeLoss $ 64.7us-gaap_NetIncomeLoss $ 62.4us-gaap_NetIncomeLoss $ 452.1us-gaap_NetIncomeLoss $ 360.5us-gaap_NetIncomeLoss $ 174.0us-gaap_NetIncomeLoss
Interest expense on convertible securities, net of taxes                 15.2us-gaap_InterestOnConvertibleDebtNetOfTax 10.5us-gaap_InterestOnConvertibleDebtNetOfTax 0us-gaap_InterestOnConvertibleDebtNetOfTax
Net income (controlling interest), as adjusted                 $ 467.3us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 371.0us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 174.0us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator                      
Average shares outstanding - basic (in shares)                 55.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 53.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 51.7us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive instruments:                      
Stock options and other awards (in shares)                 1.2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1.3us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1.3us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Forward sale (in shares)                 0us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements 0.3us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements 0us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
Junior convertible securities (in shares)                 2.2us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 2.0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Average shares outstanding - diluted (in shares)                 58.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 56.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 53.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
[1] In the fourth quarter of 2014, the Company finalized its purchase price allocation for its investment in EIG. The final purchase price allocation resulted in a change in Income from equity method investments and Intangible-related deferred taxes in the second and third quarters of 2014. Income before taxes decreased $1.6 million and $1.7 million in the second and third quarters, respectively, Net income (controlling interest) decreased $1.0 million and $1.1 million in the second and third quarters, respectively, and Earnings per share (diluted) decreased $0.02 in both periods.