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v3.19.1

Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 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 | 93.7 |  |  | 93.7 |
Repurchases of common stock | (26.6) |  |  |  | (26.6)
Stock-based compensation expense | 14.3 |  | 14.3 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 11.1 |  | (2.2) |  | 13.3
Cumulative effect of change in accounting principle - revenue recognition | 10.1 |  |  | 10.1 |
BALANCE at period end (in shares) at Mar. 31, 2018 |  | 102,562,149 |  |  |
BALANCE at period end at Mar. 31, 2018 | 2,471.9 | $ 1.0 | 16.1 | 2,936.0 | (481.2)
BALANCE at period start (in shares) at Dec. 31, 2018 |  | 102,562,149 |  |  |
BALANCE at period start at Dec. 31, 2018 | 2,716.0 | $ 1.0 | 20.8 | 3,238.3 | (544.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 92.0 |  |  | 92.0 |
Repurchases of common stock | (33.5) |  |  |  | (33.5)
Stock-based compensation expense | 13.7 |  | 13.7 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | (2.4) |  | (9.8) |  | 7.4
BALANCE at period end (in shares) at Mar. 31, 2019 |  | 102,562,149 |  |  |
BALANCE at period end at Mar. 31, 2019 | $ 2,785.8 | $ 1.0 | $ 24.7 | $ 3,330.3 | $ (570.2)

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