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Supplemental Cash Flow and Noncash Investing Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
 
2018
 
2017
 
2016
Supplemental Cash Flow Information (in millions)
 
 
 
 
 
Interest paid (1)
$
164.0

 
$
154.6

 
$
145.4

Income taxes paid, net
$
18.1

 
$
21.5

 
$
28.6