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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019
Statement Of Stockholders Equity [Abstract] |  |  |  |  |  |
Tax effect on net change in pension asset/liability | $ 0.1 |  | $ 0.3 | $ 0.2 | $ 0.2 | $ 0.4
Net change in fair value of derivative instruments, tax | $ 1.6 | $ 0.0 | $ (28.9) | $ (8.2) | $ (7.1) | $ (4.4)

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