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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | ---
BALANCE at period start (in shares) at Dec. 31, 2017 |  | 102,562,149 |  |  |
BALANCE at period start at Dec. 31, 2017 | $ 2,369.3 | $ 1.0 | $ 4.0 | $ 2,832.2 | $ (467.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 191.3 |  |  | 191.3 |
Repurchases of common stock | (100.0) |  |  |  | (100.0)
Stock-based compensation expense | 18.4 |  | 18.4 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 11.5 |  | (3.5) |  | 15.0
Cumulative effect of change in accounting principle - revenue recognition | 10.1 |  |  | 10.1 |
BALANCE at period end (in shares) at Jun. 30, 2018 |  | 102,562,149 |  |  |
BALANCE at period end at Jun. 30, 2018 | $ 2,500.6 | $ 1.0 | $ 18.9 | $ 3,033.6 | $ (552.9)

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