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Shareholders' Equity and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 23, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | $ 4,170.4 | $ 4,064.2 | $ 3,967.9 | $ 4,064.2 | $ 4,043.4
Net income |  | 290.9 |  | 287.8 | 560.8 | 556.1
Other comprehensive income (loss) |  | (13.1) |  | (151.5) | (6.7) | (88.7)
Acquisition resulting in noncontrolling interest |  | 10.0 |  | 0.2 | 10.0 | 0.3
Purchase of noncontrolling interest |  | (21.4) |  |  | (21.4) |
Distributions to shareholders of noncontrolling interests |  |  |  | (3.2) | (3.2) | (7.1)
Purchase of treasury stock |  | (248.7) |  | (263.4) | (408.7) | (645.4)
Retirement of treasury stock |  | 0.0 |  | 0.0 | 0.0 | 0.0
Stock options exercised |  | 68.0 |  | 30.5 | 115.2 | 51.2
Dividends declared |  | (68.3) |  | (69.0) | (136.8) | (126.4)
Stock-based compensation expense |  | 15.4 |  | 13.3 | 29.8 | 26.0
Balance at end of period |  | $ 4,203.2 | $ 4,170.4 | $ 3,812.6 | $ 4,203.2 | $ 3,812.6
Dividends [Abstract] |  |  |  |  |  |
Dividends declared per share (in dollars per share) |  | $ 0.23 |  | $ 0.23 | $ 0.46 | $ 0.42
Common Stock |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance (in shares) |  | 299.4 | 299.2 | 302.1 | 299.2 | 305.7
Balance at beginning of period |  | $ 0.3 | $ 0.3 | $ 0.3 | $ 0.3 | $ 0.3
Number of treasury shares retired |  | 2.6 |  | 3.1 | 3.4 | 7.3
Stock options exercised (in shares) |  | 1.6 |  | 0.7 | 2.6 | 1.3
Balance (in shares) |  | 298.4 | 299.4 | 299.7 | 298.4 | 299.7
Balance at end of period |  | $ 0.3 | $ 0.3 | $ 0.3 | $ 0.3 | $ 0.3
Additional Paid-In Capital |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | 1,485.2 | 1,433.2 | 1,282.4 | 1,433.2 | 1,249.0
Purchase of noncontrolling interest |  | (17.5) |  |  | (17.5) |
Stock options exercised |  | 58.7 |  | 30.5 | 96.3 | 51.2
Stock-based compensation expense |  | 15.4 |  | 13.3 | 29.8 | 26.0
Balance at end of period |  | 1,541.8 | 1,485.2 | 1,326.2 | 1,541.8 | 1,326.2
Retained Earnings |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | 3,142.1 | 3,028.7 | 2,770.9 | 3,028.7 | 2,941.5
Net income |  | 288.4 |  | 284.8 | 556.0 | 550.4
Retirement of treasury stock |  | (248.7) |  | (263.4) | (321.1) | (645.4)
Stock options exercised |  | (8.9) |  |  | (22.2) |
Dividends declared |  | (68.3) |  | (69.0) | (136.8) | (126.4)
Balance at end of period |  | 3,104.6 | 3,142.1 | 2,723.3 | 3,104.6 | 2,723.3
Accumulated Other Comprehensive Loss |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | (384.8) | (390.2) | (139.7) | (390.2) | (201.0)
Other comprehensive income (loss) |  | (12.1) |  | (149.0) | (6.7) | (87.7)
Balance at end of period |  | (396.9) | (384.8) | (288.7) | (396.9) | (288.7)
Treasury Stock |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | $ (119.7) | $ (55.0) | $ 0.0 | $ (55.0) | $ 0.0
Balance (in shares) |  | (1.4) | (0.7) | 0.0 | (0.7) | 0.0
Purchase of treasury stock |  | $ (248.7) |  | $ (263.4) | $ (408.7) | $ (645.4)
Purchase of treasury stock (in shares) |  | (2.6) |  | (3.1) | (4.4) | (7.3)
Retirement of treasury stock |  | $ 248.7 |  | $ 263.4 | $ 321.1 | $ 645.4
Number of treasury shares retired |  | 2.6 |  | 3.1 | 3.4 | 7.3
Stock options exercised |  | $ 18.2 |  |  | $ 41.1 |
Stock options exercised (in shares) |  | 0.2 |  |  | 0.5 |
Balance at end of period |  | $ (101.5) | $ (119.7) | $ 0.0 | $ (101.5) | $ 0.0
Balance (in shares) |  | (1.2) | (1.4) | 0.0 | (1.2) | 0.0
Noncontrolling Interests |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Balance at beginning of period |  | $ 47.3 | $ 47.2 | $ 54.0 | $ 47.2 | $ 53.6
Net income |  | 2.5 |  | 3.0 | 4.8 | 5.7
Other comprehensive income (loss) |  | (1.0) |  | (2.5) | 0.0 | (1.0)
Acquisition resulting in noncontrolling interest |  | 10.0 |  | 0.2 | 10.0 | 0.3
Purchase of noncontrolling interest |  | (3.9) |  |  | (3.9) |
Distributions to shareholders of noncontrolling interests |  |  |  | (3.2) | (3.2) | (7.1)
Balance at end of period |  | $ 54.9 | $ 47.3 | 51.5 | $ 54.9 | 51.5
Impact of ASU 2014-09 |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Cumulative effect of adoption of revenue recognition standard |  |  |  | 3.2 |  | 3.2
Impact of ASU 2014-09 | Retained Earnings |  |  |  |  |  |
Increase (Decrease) In Shareholders' Equity |  |  |  |  |  |
Cumulative effect of adoption of revenue recognition standard |  |  |  | $ 3.2 |  | $ 3.2
Subsequent Event |  |  |  |  |  |
Dividends [Abstract] |  |  |  |  |  |
Dividends declared per share (in dollars per share) | $ 0.25 |  |  |  |  |

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