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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
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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) | $ 172.6 us-gaap_NetIncomeLoss | $ 103.2 us-gaap_NetIncomeLoss | [1] | $ 99.1 us-gaap_NetIncomeLoss | [1] | $ 77.2 us-gaap_NetIncomeLoss | $ 158.2 us-gaap_NetIncomeLoss | $ 75.2 us-gaap_NetIncomeLoss | $ 64.7 us-gaap_NetIncomeLoss | $ 62.4 us-gaap_NetIncomeLoss | $ 452.1 us-gaap_NetIncomeLoss | $ 360.5 us-gaap_NetIncomeLoss | $ 174.0 us-gaap_NetIncomeLoss
Interest expense on convertible securities, net of taxes |  |  |  |  |  |  |  |  |  |  | 15.2 us-gaap_InterestOnConvertibleDebtNetOfTax | 10.5 us-gaap_InterestOnConvertibleDebtNetOfTax | 0 us-gaap_InterestOnConvertibleDebtNetOfTax
Net income (controlling interest), as adjusted |  |  |  |  |  |  |  |  |  |  | $ 467.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 371.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 174.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator |  |  |  |  |  |  |  |  |  |  |  |  |
Average shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  |  |  | 55.0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 53.1 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 51.7 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive instruments: |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and other awards (in shares) |  |  |  |  |  |  |  |  |  |  | 1.2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1.3 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1.3 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Forward sale (in shares) |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements | 0.3 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements | 0 us-gaap_IncrementalCommonSharesAttributableToEquityForwardAgreements
Junior convertible securities (in shares) |  |  |  |  |  |  |  |  |  |  | 2.2 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 2.0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Average shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  | 58.4 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 56.7 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 53.0 us-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.

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- Definition The after-tax amount of interest recognized in the period associated with any convertible debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 + Details
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