Accumulated Other Comprehensive Income (Loss) - Details of Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Increase decrease in unrecognized pension items	$ 21.8	$ 13.6	$ 2.9
Increase decrease in unrealized gain (losses) on cash flow hedging instruments	2.0	1.0	0.4
Increase decrease in cumulative translation adjustment	$ 19.8	$ 12.6	$ 3.3

The increase (decrease) in cumulative translation adjustment before transfers included in determining net income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b),(c)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Name:	us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration