Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangibles (Details 1)

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Goodwill and Other Intangibles (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]      
Goodwill, Beginning Balance $ 377.3 $ 33.9  
Acquisitions 26.0 344.2  
Goodwill, Impairment Loss 0.0 0.0 $ 0.0
Adjustments 11.7 (0.8)  
Goodwill, Ending Balance 415.0 377.3 33.9
Goodwill, Impaired, Accumulated Impairment Loss 0.0 0.0  
Marine Engine [Member]      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 375.1 31.7  
Acquisitions 0.0 344.2  
Adjustments 11.3 (0.8)  
Goodwill, Ending Balance 386.4 375.1 31.7
Boat [Member]      
Goodwill [Roll Forward]      
Goodwill, Beginning Balance 2.2 2.2  
Acquisitions 26.0 0.0  
Adjustments 0.4 0.0  
Goodwill, Ending Balance $ 28.6 $ 2.2 $ 2.2
Customer Relationships [Member]      
Goodwill [Roll Forward]      
Finite-Lived Intangible Asset, Weighted Average Remaining Useful Life 13 years 2 months 12 days    
Other      
Goodwill [Roll Forward]      
Finite-Lived Intangible Asset, Weighted Average Remaining Useful Life 10 years 8 months 12 days