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Stockholders' Equity and Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) $ in Millions | Sep. 30, 2016 USD ($)
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Stock Repurchase Program, Authorized Amount | $ 1,100.0
Stock Repurchase Program, Remaining Value Authorized to be Repurchased | $ 255.9

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant