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Debt Unrealized Gains (Losses) From Debt Hedges Included In Accumulated Other (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 06, 2017 | Dec. 31, 2016 | Jan. 26, 2015 | Apr. 22, 2014 | Aug. 17, 2011 | Nov. 21, 2002 | Mar. 01, 1999
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | $ (14.8) |  | $ (9.4) |  |  |  |  |
3.75% Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | (2.1) |  |  |  |  | $ (5.1) |  |
6 5/8% Senior Notes due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | (2.7) |  |  |  |  |  |  | $ (4.2)
6.25% Senior Notes due 2032 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | 3.6 |  |  |  |  |  | $ 5.1 |
4.35% Senior Notes due 2044 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | (1.5) |  |  |  | $ (1.6) |  |  |
3.70% Senior Notes due 2045 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | (12.2) |  |  | $ (12.9) |  |  |  |
4.125% Senior Notes due 2047 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unrealized Gain (Loss) | $ (7.9) | $ (8.0) |  |  |  |  |  |

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