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Acquisitions Business Acquisition, Pro Forma Revenue (Details) - ECS - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenues | $ 3,548.9 | $ 3,213.5
Income from continuing operations | 169.6 | 134.8
Net income | $ 169.3 | $ 134.6
Basic | $ 3.24 | $ 2.57
Diluted | $ 3.19 | $ 2.53
Basic Shares | 52.4 | 52.5
Diluted Shares | 53.2 | 53.2

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