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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Oct. 29, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018 | Aug. 01, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.220 | $ 0.42 | $ 0.650 | $ 0.81 |  |
Stock Repurchased During the Period |  |  | 802,565 |  | 802,565 |  | 182,171 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 61.67 |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 49.5 |  | $ 49.5 |  |  | $ 275.0
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.22 |  |  |  |  |  |  |
Dividends | $ 10.0 |  |  |  |  |  |  |
Stock Repurchased During the Period |  | 528,100 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 68.26 |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 36.0 |  |  |  |  |  |
Represents available for share repurchase |  | $ 65.4 |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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