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Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill |  |
Accumulated impairment losses | $ 0.0 |
Goodwill impairment loss | 0.0 |
Changes to goodwill balances by segment |  |
Goodwill balance as of January 1 | 3,053.5 | $ 3,046.2
Acquisition of Bluewater | 0.0 | 7.3
Adjustment to Bluewater purchase price allocation | (0.7) | 0.0
Goodwill balance as of December 31 | 3,052.8 | 3,053.5
Wisconsin |  |
Changes to goodwill balances by segment |  |
Goodwill balance as of January 1 | 2,104.3 | 2,104.3
Acquisition of Bluewater | 0.0 | 0.0
Adjustment to Bluewater purchase price allocation | 0.0 | 0.0
Goodwill balance as of December 31 | 2,104.3 | 2,104.3
Illinois |  |
Changes to goodwill balances by segment |  |
Goodwill balance as of January 1 | 758.7 | 758.7
Acquisition of Bluewater | 0.0 | 0.0
Adjustment to Bluewater purchase price allocation | 0.0 | 0.0
Goodwill balance as of December 31 | 758.7 | 758.7
Other States |  |
Changes to goodwill balances by segment |  |
Goodwill balance as of January 1 | 183.2 | 183.2
Acquisition of Bluewater | 0.0 | 0.0
Adjustment to Bluewater purchase price allocation | 0.0 | 0.0
Goodwill balance as of December 31 | 183.2 | 183.2
Non-Utility Energy Infrastructure |  |
Changes to goodwill balances by segment |  |
Goodwill balance as of January 1 | 7.3 | 0.0
Acquisition of Bluewater | 0.0 | 7.3
Adjustment to Bluewater purchase price allocation | (0.7) | 0.0
Goodwill balance as of December 31 | $ 6.6 | $ 7.3

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