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Acquisitions Proforma Results (Tables)
 3 Months Ended
Mar. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Business Acquisition, Pro Forma Information [Table Text Block]
(in millions, except per share data)
 Three Months Ended
March 31, 2017
Net sales
$
775.7

Net income attributable to common shareholders
$
57.0

Basic earnings per share
$
0.96

Diluted earnings per share
$
0.94