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Supplementary Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Information [Abstract]  
Schedule of cash flow, supplemental disclosures Net cash paid (received) during the period for interest, net of capitalized interest, and income taxes are presented below:
 
 
Six Months Ended June 30,
 
 
2018
 
2017
Net cash paid (received) during the period for:
 
 
 
 
Interest, net of capitalized interest
 
$
68.4

 
$
61.6

Income taxes
 
(5.9
)
 
(0.5
)
Schedule of non-cash investing and financing activities Non-cash investing and financing activities are presented below:
 
 
Six Months Ended June 30,
 
 
2018
 
2017
Capital investments
 
$
29.3

 
$
22.7

Issuance of restricted stock and restricted stock units
 
4.0

 
4.1