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Goodwill and Other Intangible Assets - Goodwill and Accumulated Goodwill Impairment Losses (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill, gross | $ 2,639.9 | $ 2,639.9
Accumulated goodwill impairment losses | (1,482.8) | (1,482.8)
Goodwill, net | 1,157.1 | 1,157.1
Operating Segments | Northeast |  |
Goodwill [Line Items] |  |
Goodwill, gross | 914.3 | 914.3
Accumulated goodwill impairment losses | (761.4) | (761.4)
Goodwill, net | 152.9 | 152.9
Operating Segments | South |  |
Goodwill [Line Items] |  |
Goodwill, gross | 236.6 | 236.6
Accumulated goodwill impairment losses | (61.0) | (61.0)
Goodwill, net | 175.6 | 175.6
Operating Segments | West |  |
Goodwill [Line Items] |  |
Goodwill, gross | 216.8 | 216.8
Accumulated goodwill impairment losses | (16.6) | (16.6)
Goodwill, net | 200.2 | 200.2
Operating Segments | Midwest |  |
Goodwill [Line Items] |  |
Goodwill, gross | 1,116.7 | 1,116.7
Accumulated goodwill impairment losses | (556.1) | (556.1)
Goodwill, net | 560.6 | 560.6
Other |  |
Goodwill [Line Items] |  |
Goodwill, gross | 155.5 | 155.5
Accumulated goodwill impairment losses | (87.7) | (87.7)
Goodwill, net | $ 67.8 | $ 67.8

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