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Changes in Stockholders' Equity (Narrative) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Purchases and retirement of common stock |  | $ 34,300,000
Stock repurchase program, outstanding balance authorized to be repurchased | $ 297,100,000 | 297,100,000
Stock repurchase program, value of remaining number of shares authorized to be repurchased | $ 31,400,000 | 31,400,000
Open Market Transaction [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock Repurchased and Retired During Period, Shares | shares | 534,403 |
Purchases and retirement of common stock | $ 34,300,000 |
Stock Repurchased and Retired During Period, Average Cost Per Share | $ / shares | $ 64.14 |
December 2016 ASR Program [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock repurchase program, authorized amount | $ 265,700,000.0 | $ 265,700,000.0

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