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Stockholders' Equity (Details) (USD $) | 12 Months Ended | 2 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 18, 2015
Stockholders' equity |  |  |  |
Common stock, shares authorized | 153,000,000 us-gaap_CommonStockSharesAuthorized | 153,000,000 us-gaap_CommonStockSharesAuthorized |  |
Share repurchase activity |  |  |  |
Shares repurchased (in shares) | 1,200,000 us-gaap_TreasuryStockSharesAcquired | 100,000 us-gaap_TreasuryStockSharesAcquired | 600,000 us-gaap_TreasuryStockSharesAcquired |
Average price (in usd per share) | $ 204.72 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 184.89 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 107.44 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Preferred Stock |  |  |  |
Stockholders' equity |  |  |  |
Preferred stock, shares authorized | 5,000,000.0 us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_PreferredStockMember |  |  |
Common Stock |  |  |  |
Share repurchase activity |  |  |  |
Shares repurchased (in shares) | 1,200,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 100,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 600,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Average price (in usd per share) | $ 204.72 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 184.89 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 107.44 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Voting Common Stock |  |  |  |
Stockholders' equity |  |  |  |
Common stock, shares authorized | 150,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Share repurchase activity |  |  |  |
Stock repurchase program, remaining shares authorized for repurchase | 1,000,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |
Class B Non-Voting Common Stock |  |  |  |
Stockholders' equity |  |  |  |
Common stock, shares authorized | 3,000,000.0 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |
Subsequent Event | Common Stock |  |  |  |
Share repurchase activity |  |  |  |
Shares repurchased (in shares) |  |  |  | 300,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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