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Reportable Business Segments (Segment Data) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Net sales |  |
Net sales | $ 834.8 | $ 793.4
Segment profit (loss) |  |
Total segment profit | 70.8 | 64.7
Reconciliation to Operating income: |  |
One time inventory write down | 0.1 | 0.0
Loss on assets held for sale | 10.3 | 0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss) | 6.5 | 3.8
Restructuring charges | 0.9 | 0.1
Operating income | 53.0 | 60.8
Residential Heating & Cooling [Member] |  |
Net sales |  |
Net sales | 453.7 | 419.8
Segment profit (loss) |  |
Total segment profit | 51.3 | 42.5
Commercial Heating & Cooling [Member] |  |
Net sales |  |
Net sales | 205.5 | 195.5
Segment profit (loss) |  |
Total segment profit | 19.5 | 19.1
Refrigeration [Member] |  |
Net sales |  |
Net sales | 175.6 | 178.1
Segment profit (loss) |  |
Total segment profit | 11.2 | 14.1
Corporate & Other [Member] |  |
Segment profit (loss) |  |
Total segment profit | $ 11.2 | $ 11.0

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