Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 Terminal
Goodwill [Roll Forward]
Balance at the beginning of the year	$ 2,095.8
Effect of exchange rate changes	(3.0)
Balance at the end of the year	2,092.8
Ammonia
Goodwill [Roll Forward]
Balance at the beginning of the year	579.5
Effect of exchange rate changes	(0.8)
Balance at the end of the year	578.7
Granular Urea
Goodwill [Roll Forward]
Balance at the beginning of the year	830.8
Effect of exchange rate changes	(1.2)
Balance at the end of the year	829.6
UAN
Goodwill [Roll Forward]
Balance at the beginning of the year	577.8
Effect of exchange rate changes	(0.8)
Balance at the end of the year	577.0
Other
Goodwill [Roll Forward]
Balance at the beginning of the year	107.7
Effect of exchange rate changes	(0.2)
Balance at the end of the year	107.5
Ammonia Terminals in Canada
Goodwill [Roll Forward]
Number of ammonia terminals acquired		3
Aggregate purchase price		72.5
Goodwill, acquired during period		32.2
Ammonia Terminals in Canada | Ammonia
Goodwill [Roll Forward]
Balance at the end of the year		8.9
Ammonia Terminals in Canada | UAN
Goodwill [Roll Forward]
Balance at the end of the year		8.9
Ammonia Terminals in Canada | Other
Goodwill [Roll Forward]
Balance at the end of the year		1.6
Granular Urea | Granular Urea
Goodwill [Roll Forward]
Balance at the end of the year		$ 12.8