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Acquisition (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Jan. 31, 2015	Mar. 16, 2015	Nov. 01, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Assets acquired [Abstract]
Goodwill				$ 3,710.0us-gaap_Goodwill	$ 3,684.7us-gaap_Goodwill	$ 3,821.6us-gaap_Goodwill
LPC [Member]
Business Acquisition [Line Items]
Consideration Transferred	100.0
Assets acquired [Abstract]
Goodwill	25.3
Current assets (including $21.1 million in cash)	106.1
Property, plant and equipment	29.3
Intangibles	49.2
Liabilities assumed:
Current liabilities	(106.1)
Deferred tax liability	(3.8)
Net assets acquired	100.0
Coronado [Member]
Business Acquisition [Line Items]
Consideration Transferred		602.1
Assets acquired [Abstract]
Current assets (including $21.1 million in cash)		26.2
Property, plant and equipment		306.0
Intangibles		294.0
Liabilities assumed:
Current liabilities		(24.1)
Net assets acquired		602.1
Chevron Acquisition [Member]
Business Acquisition [Line Items]
Consideration Transferred			231.5
Assets acquired [Abstract]
Property, plant and equipment			225.3
Intangibles			13.0
Liabilities assumed:
Current liabilities			(6.8)
Net assets acquired			$ 231.5