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Net Earnings Per Common Share - Calculation of Basic and Diluted Net Earnings (Loss) Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Numerator |  |
Net earnings available to common stockholders | $ 97.2 us-gaap_ProfitLoss | $ 70.9 us-gaap_ProfitLoss
Distributed and allocated undistributed net loss to non-vested restricted stockholders | (0.6)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic | (0.4)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Distributed and allocated undistributed net earnings to common Stockholders | 96.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 70.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Distributed net earnings - dividends paid to common stockholders | (27.3)us-gaap_DistributedEarnings | (27.7)us-gaap_DistributedEarnings
Allocation of undistributed net earnings to common Stockholders | 69.3 us-gaap_UndistributedEarnings | 42.8 us-gaap_UndistributedEarnings
Denominator |  |
Weighted average number of common shares outstanding - basic | 208.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 206.7 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net earning per common share: |  |
Distributed net earnings to common stockholders | $ 0.13 us-gaap_EarningsPerShareBasicDistributed | $ 0.13 us-gaap_EarningsPerShareBasicDistributed
Allocated undistributed net earnings to common stockholders | $ 0.33 us-gaap_EarningsPerShareBasicUndistributed | $ 0.21 us-gaap_EarningsPerShareBasicUndistributed
Net earnings (loss) per common share - basic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic
Numerator |  |
Distributed and allocated undistributed net earnings to common Stockholders | 96.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 70.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: Allocated undistributed net earnings to non-vested restricted Stockholders | 0.5 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits | 0.3 us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Less: Undistributed net earnings reallocated to non-vested restricted Stockholders | (0.5)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | (0.3)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net earnings available to common stockholders - diluted | $ 96.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 70.5 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator |  |
Weighted average number of common shares outstanding - basic | 208.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 206.7 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of assumed issuance of Settlement agreement shares |  | 6.6 see_EffectOfAssumedIssuanceOfSettlementAgreementShares
Effect of contingently issuable shares | 1.2 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 0.6 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Effect of non-vested restricted stock units | 1.6 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1.2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average number of common shares outstanding - diluted | 211.7 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 215.1 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net earnings per common share | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted

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