Capital Stock, Equity and Accumulated Other Comprehensive Loss - Changes in AOCI, Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	$ 3,017.7	$ 3,029.3	$ 3,149.5
Balance at end of year	3,192.9	3,017.7	3,029.3
Defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(194.6)	(219.2)	(104.5)
Gains (losses) reclassified from accumulated other comprehensive loss	25.9	4.2	0.1
Other comprehensive income (loss) recognized during the period	(24.1)	20.4	(114.8)
Balance at end of year	(192.8)	(194.6)	(219.2)
Comprehensive income (loss), tax
Reclassification adjustments, tax expense (benefit)	12.1	1.4
Other comprehensive income (loss), tax expense (benefit)	(5.0)	6.9	(56.5)
Derivative instruments and hedging
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(38.7)	(33.2)	(5.3)
Gains (losses) reclassified from accumulated other comprehensive loss	57.9	23.7	(6.4)
Other comprehensive income (loss) recognized during the period	(64.3)	(29.2)	(21.5)
Balance at end of year	(45.1)	(38.7)	(33.2)
Comprehensive income (loss), tax
Reclassification adjustments, tax expense (benefit)	28.8	14.9	(1.8)
Other comprehensive income (loss), tax expense (benefit)	(32.7)	(18.4)	(13.0)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of year	(496.8)	(249.6)	(56.3)
Other comprehensive income (loss) recognized during the period	(100.9)	(247.2)	(193.3)
Balance at end of year	(597.7)	(496.8)	(249.6)
Comprehensive income (loss), tax
Other comprehensive income (loss), tax expense (benefit)	$ (1.1)	$ (6.0)	$ (7.4)