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v3.19.3

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, 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 | 303.3 |  |  |  |
BALANCE at period end (in shares) at Sep. 30, 2018 |  | 102,562,149 |  |  |
BALANCE at period end at Sep. 30, 2018 | 2,618.0 | $ 1.0 | 19.7 | 3,145.6 | (548.3)
BALANCE at period start (in shares) at Mar. 31, 2018 |  | 102,562,149 |  |  |
BALANCE at period start at Mar. 31, 2018 | 2,471.9 | $ 1.0 | 16.1 | 2,936.0 | (481.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 97.6 |  |  | 97.6 |
Repurchases of common stock | (73.4) |  |  |  | (73.4)
Stock-based compensation expense | 4.1 |  | 4.1 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 0.4 |  | (1.3) |  | 1.7
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 112.0 |  |  | 112.0 |
Stock-based compensation expense | 3.6 |  | 3.6 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 1.8 |  | (2.8) |  | 4.6
BALANCE at period end (in shares) at Sep. 30, 2018 |  | 102,562,149 |  |  |
BALANCE at period end at Sep. 30, 2018 | 2,618.0 | $ 1.0 | 19.7 | 3,145.6 | (548.3)
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)
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 | 292.3 |  |  |  |
BALANCE at period end (in shares) at Sep. 30, 2019 |  | 102,562,149 |  |  |
BALANCE at period end at Sep. 30, 2019 | 2,996.7 | $ 1.0 | 34.1 | 3,530.6 | (569.0)
BALANCE at period start (in shares) at Mar. 31, 2019 |  | 102,562,149 |  |  |
BALANCE at period start at Mar. 31, 2019 | 2,785.8 | $ 1.0 | 24.7 | 3,330.3 | (570.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 100.8 |  |  | 100.8 |
Repurchases of common stock | (11.2) |  |  |  | (11.2)
Stock-based compensation expense | 4.9 |  | 4.9 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 2.6 |  | (4.0) |  | 6.6
BALANCE at period end (in shares) at Jun. 30, 2019 |  | 102,562,149 |  |  |
BALANCE at period end at Jun. 30, 2019 | 2,882.9 | $ 1.0 | 25.6 | 3,431.1 | (574.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 99.5 |  |  | 99.5 |
Stock-based compensation expense | 9.5 |  | 9.5 |  |
Shares awarded under stock-based compensation plans, net of shares withheld for taxes | 4.8 |  | (1.0) |  | 5.8
BALANCE at period end (in shares) at Sep. 30, 2019 |  | 102,562,149 |  |  |
BALANCE at period end at Sep. 30, 2019 | $ 2,996.7 | $ 1.0 | $ 34.1 | $ 3,530.6 | $ (569.0)

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