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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Stockholders Equity [Abstract] |  |  |
Tax effect on net change in pension asset/liability | $ 0.1 | $ 1.1 | $ 6.2
Net change in fair value of derivative instruments, tax | $ (22.4) | $ (8.9) | $ (5.6)

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