Accumulated Other Comprehensive Income - Amounts in OCI (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax benefit plan adjustment amounts arising during the current period	$ (232.6)	$ 251.0	$ (56.3)
Income tax related to benefit plan adjustment amounts arising during the current period	78.5	(113.8)	17.3
Pretax benefit plan adjustment amounts reclassified to net income	95.7	76.7	78.3
Income tax related to benefit plan adjustment amounts reclassified to net income	(36.0)	(27.2)	(27.2)
Total benefit plan adjustments, net of tax	(94.4)	186.7	12.1
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax foreign currency adjustment amounts arising during the current period	(88.3)	(32.3)	3.4
Income tax related to foreign currency adjustment amounts arising during the current period	0	0	(0.2)
Pretax foreign currency adjustment amounts reclassified to net income	1.3	(0.5)	0
Income tax of foreign currency adjustment amounts reclassified to net income	0.3	0.1	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(86.7)	(32.7)	3.2
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Pretax unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0.1	(0.3)	0.8
Income tax related to unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0	0.1	(0.2)
Pretax unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	(0.5)	0.4	(2.9)
Income tax related to unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	0.2	(0.2)	1.0
Total unrealized gains (losses) on available-for-sale securities, net of tax	(0.2)	0	(1.3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Pretax gains (losses) on cash flow hedge amounts arising during the current period	0.7	2.9
Income tax related tocash flow hedge amounts arising during the current period	0	0
Pretax cash flow hedge amounts reclassified to net income	(0.9)	(2.3)
Income tax related to cash flow hedge amounts reclassified to net income	0	0
Total gains (losses) on cash flow hedge, net of tax	(0.2)	0.6
Total pretax other comprehensive income (loss) arising during the current period	(320.1)	221.3	(52.1)
Total income tax related to other comprehensive income (loss) arising during the current period	78.5	(113.7)	16.9
Total other comprehensive income (loss) reclassified to net income	95.6	74.3	75.4
Total income tax related to other comprehensive income (loss) reclassified to net income	(35.5)	(27.3)	(26.2)
Total other comprehensive income (loss)	(181.5)	154.6	14.0
Parent [Member]
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax benefit plan adjustment amounts arising during the current period	(231.2)	251.9	(53.4)
Income tax related to benefit plan adjustment amounts arising during the current period	78.1	(114.1)	17.3
Pretax benefit plan adjustment amounts reclassified to net income	95.3	76.4	78.3
Income tax related to benefit plan adjustment amounts reclassified to net income	(35.9)	(27.1)	(27.2)
Total benefit plan adjustments, net of tax	(93.7)	187.1	15.0
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax foreign currency adjustment amounts arising during the current period	(82.2)	(30.9)	1.0
Income tax related to foreign currency adjustment amounts arising during the current period	0	0	(0.2)
Pretax foreign currency adjustment amounts reclassified to net income	1.3	(0.5)	0
Income tax of foreign currency adjustment amounts reclassified to net income	0.3	0.1	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(80.6)	(31.3)	0.8
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Pretax unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0.1	(0.3)	0.8
Income tax related to unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0	0.1	(0.2)
Pretax unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	(0.5)	0.4	(2.9)
Income tax related to unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	0.2	(0.2)	1.0
Total unrealized gains (losses) on available-for-sale securities, net of tax	(0.2)	0	(1.3)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Pretax gains (losses) on cash flow hedge amounts arising during the current period	0.7	2.9
Income tax related tocash flow hedge amounts arising during the current period	0	0
Pretax cash flow hedge amounts reclassified to net income	(0.9)	(2.3)
Income tax related to cash flow hedge amounts reclassified to net income	0	0
Total gains (losses) on cash flow hedge, net of tax	(0.2)	0.6
Total pretax other comprehensive income (loss) arising during the current period	(312.6)	223.6	(51.6)
Total income tax related to other comprehensive income (loss) arising during the current period	78.1	(114.0)	16.9
Total other comprehensive income (loss) reclassified to net income	95.2	74.0	75.4
Total income tax related to other comprehensive income (loss) reclassified to net income	(35.4)	(27.2)	(26.2)
Total other comprehensive income (loss)	(174.7)	156.4	14.5
Noncontrolling Interest [Member]
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax benefit plan adjustment amounts arising during the current period	(1.4)	(0.9)	(2.9)
Income tax related to benefit plan adjustment amounts arising during the current period	0.4	0.3	0
Pretax benefit plan adjustment amounts reclassified to net income	0.4	0.3	0
Income tax related to benefit plan adjustment amounts reclassified to net income	(0.1)	(0.1)	0
Total benefit plan adjustments, net of tax	(0.7)	(0.4)	(2.9)
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract]
Pretax foreign currency adjustment amounts arising during the current period	(6.1)	(1.4)	2.4
Income tax related to foreign currency adjustment amounts arising during the current period	0	0	0
Pretax foreign currency adjustment amounts reclassified to net income	0	0	0
Income tax of foreign currency adjustment amounts reclassified to net income	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(6.1)	(1.4)	2.4
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract]
Pretax unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0	0	0
Income tax related to unrealized gains (losses) on available-for-sale securities amounts arising during the current period	0	0	0
Pretax unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	0	0	0
Income tax related to unrealized gains (losses) on available-for-sale securities amounts reclassified to net income	0	0	0
Total unrealized gains (losses) on available-for-sale securities, net of tax	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Pretax gains (losses) on cash flow hedge amounts arising during the current period	0	0
Income tax related tocash flow hedge amounts arising during the current period	0	0
Pretax cash flow hedge amounts reclassified to net income	0	0
Income tax related to cash flow hedge amounts reclassified to net income	0	0
Total gains (losses) on cash flow hedge, net of tax	0	0
Total pretax other comprehensive income (loss) arising during the current period	(7.5)	(2.3)	(0.5)
Total income tax related to other comprehensive income (loss) arising during the current period	0.4	0.3	0
Total other comprehensive income (loss) reclassified to net income	0.4	0.3	0
Total income tax related to other comprehensive income (loss) reclassified to net income	(0.1)	(0.1)	0
Total other comprehensive income (loss)	$ (6.8)	$ (1.8)	$ (0.5)