Interim Financial Statements - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Recent Accounting Pronouncements
Decrease in other current assets due to reclassification related to ASU	$ (99.3)	$ (73.9)
Accounting Standards Update 2015-17
Recent Accounting Pronouncements
Decrease in other current assets due to reclassification related to ASU		28.1
Decrease in deferred tax liabilities due to reclassification related to ASU		$ 28.1

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31931-109318

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant