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Goodwill and Other Intangible Assets - Goodwill and Accumulated Goodwill Impairment Losses (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2021
Goodwill [Line Items] |  |
Goodwill, gross | $ 2,639.9 | $ 2,648.4
Accumulated goodwill impairment losses | (1,482.8) | (1,482.8)
Goodwill, net | 1,157.1 | 1,165.6
Goodwill acquired during the period | 8.5 |
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
Goodwill acquired during the period | 0.0 |
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
Goodwill acquired during the period | 0.0 |
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
Goodwill acquired during the period | 0.0 |
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
Goodwill acquired during the period | 0.0 |
Other |  |
Goodwill [Line Items] |  |
Goodwill, gross | 155.5 | 164.0
Accumulated goodwill impairment losses | (87.7) | (87.7)
Goodwill, net | 67.8 | $ 76.3
Goodwill acquired during the period | $ 8.5 |

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