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Subsequent events (Details) - Subsequent Event [Member] - USD ($) | Mar. 02, 2018 | Jan. 31, 2018
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Subsequent Event [Line Items] |  |
Share repurchase, remaining amount under the program | $ 145,700,000 |
Senior Notes [Member] | AGAT/AICDC Notes Due 2023 [Member] |  |
Subsequent Event [Line Items] |  |
Face amount |  | $ 600,000,000
Stated interest rate |  | 3.30%
Senior Notes [Member] | AGAT/AICDC Notes Due 2028 [Member] |  |
Subsequent Event [Line Items] |  |
Face amount |  | $ 550,000,000
Stated interest rate |  | 3.875%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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- Details
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- Details
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- Details
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- Details
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